Overpopulation - Wikipedia

Overpopulation - Wikipedia
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When a population of a species exceeds the carrying capacity of its environment
This article is about overpopulation in biology in general. For human overpopulation, see
human overpopulation
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January 2021
Overpopulation
or
overabundance
is a state in which the
population
of a
species
is larger than the
carrying capacity
of its
environment
This may be caused by increased birth rates, lowered
mortality rates
, reduced
predation
or large scale
migration
, leading to an overabundant species and other animals in the
ecosystem
competing
for food, space, and resources. The animals in an overpopulated area may then be forced to migrate to areas not typically inhabited, or die off without access to necessary resources.
Ōkunoshima
is overpopulated with
rabbits
Judgements regarding overpopulation always involve both facts and values. Animals are often judged overpopulated when their numbers cause impacts that people find dangerous, damaging, expensive, or otherwise harmful. Societies may be judged overpopulated when their human numbers cause impacts that degrade
ecosystem services
, decrease human health and well-being, or crowd other species out of existence.
Background
edit
In
ecology
, overpopulation is a concept used primarily in
wildlife management
Typically, an overpopulation causes the entire population of the species in question to become weaker
, as no single individual is able to find enough food or shelter. As such, overpopulation is thus characterized by an increase in the diseases and parasite-load which live upon the species in question, as the entire population is weaker. Other characteristics of overpopulation are lower fecundity, adverse effects on the environment (soil, vegetation or fauna) and lower average body weights.
Especially the worldwide increase of deer populations, which usually show
irruptive growth
, is proving to be of ecological concern. Ironically, where
ecologists
were preoccupied with conserving or augmenting deer populations only a century ago, the focus has now shifted in the direct opposite, and ecologists are now more concerned with limiting the populations of such animals.
Supplemental feeding of charismatic species or interesting game species is a major problem in causing overpopulation,
as is too little hunting or trapping of such species. Management solutions are increasing hunting by making it easier or cheaper for (foreign) hunters to hunt,
banning supplemental feeding,
awarding bounties,
forcing landowners to hunt or contract professional hunters,
10
using
immunocontraception
11
promoting the harvest of venison or other wild meats,
12
introducing large predators (
rewilding
),
13
14
poisonings or introducing diseases.
A useful tool in wildlife culling is the use of mobile freezer trailers in which to store carcasses.
15
The harvest of meat from wild animals is a
sustainable
method of creating a
circular economy
12
Immunocontraception
is a non-lethal method of regulating wild-animal population growth. Immunocontraception has been successfully used or tested in a variety of wild-animal populations including those of
bison
16
deer
17
elephants
18
gray squirrels
19
pigeons
18
rats
and
wild horses
20
18
Among the limitations of injectable immunocontraceptives are a relatively long time between vaccine administration and a reduction in population size (although stabilization of population size occurs faster)
21
22
and the need to be in close proximity with animals for injection.
23
Oral vaccines do not have the latter limitation, but they are still not as well developed as injectable vaccines.
24
23
Judgements about overpopulation of wildlife or domestic animals typically are made in terms of human purposes and interests; since these vary, such judgements may vary, too. Judgements about human overpopulation are even more contentious, since the purposes and interests involved may be very important, even rising to the level of existence itself.
25
26
Nevertheless, all people and every society have an interest in preserving a habitable biosphere, which may be compromised or degraded by too may people.
27
28
In the context of rapid climate change, mass species extinction and other global environmental problems, discussions regarding human overpopulation are inevitable.
29
30
Recent scientific evidence from many sources suggests Earth may be overpopulated currently. Evidence of rapidly declining ecosystem services was presented in detail in the Millennium Ecosystem Assessment of 2005, a collaborative effort involving more than 1,360 experts worldwide.
31
More recent scientific accounts are provided by ecological footprint accounting
32
and interdisciplinary research on
planetary boundaries
for safe human use of biosphere.
33
The
Sixth Assessment Report on Climate Change
from the
IPCC
and the
First Assessment Report on Biodiversity and Ecosystem Services
by the
IPBES
, large international summaries of the state of scientific knowledge regarding climate disruption and
biodiversity loss
, also support the view that unprecedented human numbers are contributing to global ecological decline.
34
35
Recent estimates of a
sustainable global human population
run between two and four billion people.
28
36
Judgements about human or animal overpopulation hinge partly on whether people feel a moral obligation to leave sufficient habitat and resources to preserve viable populations of other species.
37
Recent biodiversity losses show that humanity's success in supporting larger human populations over the past century has depended on reducing the populations of many of Earth's other species.
35
38
This is a special example of the
competitive exclusion principle
in ecology, which states that two species which compete for the same limited resource cannot coexist at constant population values.
39
Today humanity essentially competes with other species everywhere on Earth.
35
40
We thus face choices regarding whether to preserve populations of other species and limit our own, or not.
41
42
These essentially ethical choices
43
44
will make a difference in future judgements about overpopulation.
38
45
Well-studied species
edit
Deer
edit
In the
Scottish Highlands
, the arrangement in which landowners privately cull the overpopulation of
red deer
has proved an abject failure.
10
46
Scotland's deer are stunted, emaciated, and frequently starve in the Spring.
46
As of 2016, the population is now so high that 100,000 deer would need to be culled each year just to maintain the current population.
10
A number of landowners have proven unwilling to accede to the law, requiring government intervention anyway. It has been necessary to contract professional hunters in order to satisfy landowner legislation regarding the annual cull.
Millions of pounds of taxpayers' cash is spent on the annual cull.
14
As of 2020, 100,000 deer are shot each year.
12
Compounding the problem, some landowners have used supplemental feeding at certain shooting blinds in order to facilitate sport hunting.
46
Overpopulation can affect
forage
plants, eventually causing a species to alter the greater environment.
47
Natural ecosystems are extremely complex. The overpopulation of deer in Britain has been caused by legislation making hunting more difficult,
48
49
but another reason may be the proliferation of forests, used by different deer species to breed and shelter. Forests and parks have caused Britain to be much more forested than it was in recent history,
49
and may thus perversely be causing
biodiversity loss
47
50
conversion of
heath
habitat to grassland,
10
extirpation of grassland and woodland plants due to
overgrazing
and the changing of the
habitat
structure.
50
Examples are
bluebells
and
primroses
. Deer open up the forest and reduce the amount of brambles, which then has knock-on effects on
dormice
and certain birds which nest near the ground,
47
50
such as the
capercaillie
dunnock
nightingale
song thrush
willow warbler
marsh tit
willow tit
and
bullfinch
47
Populations of the nightingale and the
European turtle dove
are believed to be primarily impacted by
muntjac
48
Grouse populations suffer due to smashing into the fencing needed to protect against deer.
citation needed
A significant amount of the
environmental destruction
in Britain is caused by an overabundance of deer. Besides ecological effects, overpopulation of deer causes economic effects due to browsing on crops, expensive fencing needed to combat this and protect new
afforestation
planting and
coppice
growth, and increasing numbers of
road traffic incidents
47
48
High populations cause stripping of the bark of trees, eventually destroying forests. Protecting forests from deer costs on average three times
clarification needed
over what period?
as much as planting the forest in the first place.
47
The NGO
Trees for Life
spent weeks planting native trees in Scotland, aiming to rebuild the ancient
Caledonian Forest
. After winter snowdrifts in 2014/2015 flattened the deer fences, more than a decade's growth was lost in a matter of weeks.
In 2009 – 2010 the cost of
forest protection
in Scotland ran to £10.5m.
14
Some animals, such as
muntjac
, are too small and boring for most hunters to shoot, which poses additional management problems.
47
In the United States the exact same problem is seen with
white-tailed deer
, where populations have exploded and become
invasive species
in some areas. The state of Wisconsin has an estimated population of 1.9 million White tail deer, measured in 2020.
51
In continental Europe
roe deer
pose a similar problem: although the populations were formerly much less, they have swelled in the 20th century so that although two and a half million are shot each year by hunters in Western Europe alone, as of 1998, the population still appears to be increasing, causing problems for forestry and traffic. In an experiment where roe deer on a Norwegian island were freed from human harvest and predators, the deer doubled in population each year or two.
In the Netherlands and southern England roe deer were extirpated from the entirety of the country except for a few small areas around 1875. In the 1970s the species was still completely absent from Wales, but as of 2013, it has colonized the entire country.
50
52
53
As new forests were planted in the Netherlands in the 20th century, the population began to expand rapidly. As of 2016 there are some 110,000 deer in the country.
53
Birds
edit
Aquaculture
operations, recreation angling and populations of
endangered
fish such as the
schelly
are impacted by
cormorant
populations. Open aquaculture ponds provide winter or year-round homes and food for cormorants. Cormorants' effect on the aquaculture industry is significant, with a dense flock capable of consuming an entire harvest.
54
55
56
57
58
Cormorants are estimated to cost the catfish industry in Mississippi alone between $10 million and $25 million annually.
57
Cormorant culling
is commonly achieved by sharp-shooting, nest destruction, roost dispersal and
oiling the eggs
55
57
Geese numbers have also been called overpopulated. In the Canadian Arctic region,
snow geese
Ross's geese
greater white-fronted geese
and some populations of
Canada geese
have been increasing significantly over the past decades. Lesser snow geese populations have increased to over three million, and continue to increase by some 5% per year.
Giant Canada geese
have grown from near extinction to nuisance levels, in some areas. Average body sizes have decreased and parasite loads are higher. Before the 1980s, Arctic geese populations had boom and bust cycles (see above) thought to be based on food availability, although there are still some bust years, this no longer seems the case.
59
It is difficult to know what the numbers of geese were before the 20th century, before human impact presumably altered them. There are a few anecdotal claims from that time of two or three million, but these are likely exaggerations, as that would imply a massive die-off or vast amounts harvested, for which there is no evidence. More likely estimates from the period of 1500 to 1900 are a few hundred thousand animals, which implies that with the exception of Ross's geese, modern populations of geese are many millions more than in pre-industrial levels.
59
Humans are blamed as the ultimate cause for the increase, directly and indirectly, due to management legislation limiting hunting introduced specifically in order to protect bird populations, but most importantly due to the increase in agriculture and large parks, which has created vast amounts of unintentional sanctuaries filled with food.
59
Urban geese flocks have increased enormously. City ordinances generally prohibit discharging firearms, keeping such flocks safe, and there is abundant food.
60
Geese profit from agricultural grain crops, and seem to be shifting their habitat preferences to such farmlands. Reduction of goose hunting in the US since the 1970s seems to have further protected populations. In Canada hunting has also decreased dramatically, from 43.384% harvest rates in the 1960s to 8% in the 1990s. Nonetheless, when kill rates were compared to populations, hunting alone does not seems to be solely responsible for the increase; weather and a shift in habitat preference toward agricultural land may also be factors. Although hunting may have formerly been the main factor in maintaining stable populations, ecologists no longer consider it a practical management solution, as public interest in the practice has continued to wane, and the population is now so large that the massive culls needed are unrealistic to ask from the public.
Climate change
in the Arctic would appear to be an obvious cause for the increase, but when subpopulations are correlated with local climatic increases, this does not seem to hold true, and furthermore, breeding regions seem to be shifting southwards anyway, irrespective of climate change.
59
The nutrient subsidy provided by foraging in agricultural land may have made the overall landscape use by geese unsustainable. Where such geese congregate local plant communities have been substantially altered; these chronic effects are cumulative, and have been considered a threat to the Arctic ecosystems, due to knock-on effects on native ducks, shorebirds and passerines.
Grubbing
and
overgrazing
by geese completely denudes the tundra and marshland, in combination with abiotic processes, this creates large desert expanses of hypersaline, anoxic mud which continue to increase each year.
Biodiversity
drops to only one or two species which are inedible for geese, such as
Senecio congestus
Salicornia borealis
and
Atriplex hastata
. Because grazing occurs in serial stages, with biodiversity decreasing at each stage, floral composition may be used as an indicator of the degree of goose foraging at a site. Other effects are destruction of the vegetation holding dunes in place, the shift from sedge
meadows
and grassy swards with
herbaceous plants
to moss fields, which can eventually give way to bare ground called 'peat barrens', and the erosion of this bare peat until glacial gravel and till is bared. In the High Arctic research is less developed:
Eriophorum scheuchzeri
and
E. angustifolium
fens appear to be affected, and are being replaced by carpets of moss, whereas meadows covered in
Dupontia fisheri
appear to be escaping destruction. There does not appear to be the damage found at lower latitudes in the Arctic. There is little proper research in effects on other birds. The yellow rail (
Coturnicops noveboracensis
) appears to be extirpated from areas of Manitoba due
habitat loss
caused by the geese, whereas on the other hand the semipalmated plover (
Charadrius semipalmatus
) appears to be taking advantage of the large areas of dead willows as a breeding ground.
59
In the wintering grounds in continental USA, effects are much less pronounced. Experimentally excluding geese by means of fencing in
North Carolina
has found heavily affected areas can regenerate after only two years. Bulrush stands (
Schoenoplectus americanus
) are still an important component of the diet, but there are indications the bulrush is being impacted, with soft mudflats gradually replacing areas where it grows.
59
Damage to agriculture is primarily to seedlings,
winter wheat
and hay production. Changing the
species composition
to species less palatable to geese, such as
Lotus
may alleviate losses in hay operations. Geese also feed on agricultural land without causing economic loss,
gleaning
seeds from corn, soya or other grains and feeding on wheat, potato and corn stubble. In
Québec
crop damage insurance for the hay industry began in 1992 and claims increased yearly; actual compensation paid by the government, including administrative costs, amount to some half a million dollars a year.
59
Arctic regions are remote, there is little public understanding for combatting the problem, and ecologists as yet do not have any effective solutions for combatting the problem anyway. In Canada, the most important hunters of geese are the
Cree people
around Hudson Bay, members of the Mushkegowuk Harvesters Association, with an average kill rate of up to 60.75 birds per species per hunter in the 1970s. Kill rates have dropped, with hunters taking only half as much in the 1990s. However, total numbers of kills have increased, i.e. there are more hunters, but they are killing less per person. Nonetheless, per household the kills are approximately the same, at 100 birds. This indicates that stimulating an increase in native hunting might be difficult to achieve. The Cree population has increased. Elders say the taste of the birds has gotten worse, and they are thinner: both possibly due to the overpopulation. Elders also say that hunting has gotten more difficult, because there are fewer young and goslings, which are more likely to fall for
decoys
Inuit
and other people in the north do much less hunting of geese, with kill rates of 1 to 24 per species per hunter. Hunters can save some $8.14 to $11.40 per kilogram compared to buying poultry at stores. Total kill numbers from hunters elsewhere in the US and southern Canada have been falling steadily. This is blamed on a decline in people interested in hunting, more feeding areas for the birds, and larger flocks with more experienced adult birds which makes decoying difficult. Individual hunters are bagging higher numbers, compensating for lower hunter numbers.
59
Management strategies in the USA include increasing the bag limit and the number of open hunting days,
goose egg addling
, trapping and relocation, and egg and nest destruction, managing habitat to make it less attractive to geese, harassment and direct culling.
60
In
Denver, Colorado
, during moulting season biologists rounded up 300 Canada geese (of 5,000 in the city), ironically on
Canada Day
, killing them and distributing the meat to needy families (as opposed to sending it to a landfill), to try to curb the number of geese, following such programs in New York, Pennsylvania, Oregon and Maryland. Complaints about the birds were that they had taken over the golf courses, spread feces, devoured native plants, and scared people. Such culls have proven socially controversial, with intense backlash by some citizens. Park officials had tried dipping eggs in oil, using noise-makers and planting tall plants, but this was not sufficient.
61
In Russia, the problem does not seem to exist, likely due to human harvest and local long-term cooling climate trends in the
Russian Far East
and
Wrangel Island
59
It is also possible that the population growth is completely natural, and that when the carrying capacity of the environment is reached the population will stop growing.
59
For organisations such as
Ducks Unlimited
, the resurgence of goose populations in North America can be called one of the greatest success stories in wildlife management. By 2003 the US goose harvest was approaching 4 million, three times the numbers 30 years previously.
62
Pets
edit
This section is an excerpt from
Overpopulation of domestic pets
edit
In some countries, there is an
overpopulation
of
pets
such as
cats
dogs
, and
exotic animals
. In the United States, six to eight million animals are brought to
shelters
each year, of which an estimated three to four million are subsequently
euthanized
, including 2.7 million considered healthy and adoptable.
63
64
Euthanasia numbers have declined since the 1970s, when U.S. shelters euthanized an estimated 12 to 20 million animals.
65
Most
humane societies
animal shelters
, and
rescue groups
urge animal caregivers to have their animals
spayed or neutered
to prevent the births of unwanted and accidental
litters
that could contribute to this dynamic.
64
In the United States, over half of the households own a dog or a cat. Even with so much pet ownership there is still an issue with pet overpopulation, especially seen in shelters.
66
Because of this problem it is estimated that between 10 and 25 percent of dogs and cats are killed yearly. The animals are killed humanely, but the goal is to greatly lower and eventually completely avoid this.
66
Estimating the overpopulation of pets, especially cats and dogs, is a difficult task, but it has been a continuous problem. It has been hard to determine the number of shelters and animals in each shelter around even just the US.
67
Animals are constantly being moved around or euthanized, so it is difficult to keep track of those numbers across the country. It is becoming universally agreed upon that sterilization is a tool that can help reduce population size so that less offspring are produced in the future
68
With less offspring, pet populations can start to decrease which reduces the amount that get killed each year.
68
Population cycles
edit
Main articles:
Population cycle
and
Lotka–Volterra equations
In the wild, rampant population growth of prey species often causes growth in the populations of
predators
Such predator-prey relationships can form cycles, which are usually mathematically modelled as
Lotka–Volterra equations
69
70
In natural
ecosystems
, predator population growth lags just behind the prey populations. After the prey population crashes, the overpopulation of predators causes the entire population to be subjected to mass starvation. The population of the predator drops, as less young are able to survive into adulthood. This could be considered a perfect time for wildlife managers to allow hunters or trappers to harvest as much of these animals as necessary, for example
lynx
in Canada, although on the other hand this may impact the ability of the predator to rebound when the prey population begins to exponentially increase again.
Such mathematical models are also crucial in
determining the amount of fish
which may be sustainably harvested in
fisheries
71
this is known as the
maximum sustainable yield
72
Predator population growth has the effect of controlling the prey population, and can result in the
evolution
of prey species in favour of genetic characteristics that render it less vulnerable to predation (and the predator may
co-evolve
, in response).
73
In the absence of predators, species are bound by the resources they can find in their environment, but this does not necessarily control overpopulation, at least in the short term. An abundant supply of resources can produce a population boom followed by a population crash. Rodents such as
lemmings
and
voles
have such
population cycles
of rapid growth and subsequent decrease.
74
75
Snowshoe hares
populations similarly cycle dramatically, as did those of one of their predators, the
lynx
Another example is the cycles among populations of grey wolves and moose in
Isle Royale National Park
76
For some still unexplained reason, such patterns in mammal
population dynamics
are more prevalent in ecosystems found at more arctic latitudes.
74
Some species such as
locusts
experience large natural cyclic variations, experienced by farmers as
plagues
77
Determining population size/density
edit
When determining whether a species is overpopulated, a variety of factors must be looked at. Given the complexity of the issue, scientists and wildlife managers often differ in judging such claims. In many cases scientists will look to food sources and living space to gauge the abundance of a species in a particular area. National parks collect extensive data on the activities and quality of the environment in which they are established. This data can be used to track whether a specific species is consuming larger amounts of their desired food source over time.
78
This is done typically in four ways:
Total counting. Researchers will use aerial photography to count large populations in a specific area such as deer, waterfowl, and other "flocking" or "herd" animals.
Incomplete counts involve counting a small subsection of a population and extrapolating the data across the whole area. This method will take into account the behavior of the animals such as how much territory a herd may cover, the density of the population, and other potential factors that may come into question.
79
"Indirect counts"; this is done by looking at the environment for signs of animal presence. Typically done by counting fecal matter or dens/nesting of a particular animal. This method is not as accurate as direct counting, but gives general counts of a population in a specific locale.
79
The method of mark-recapture is used extensively to determine general population sizes. Animals are trapped, and some form of tag is placed on the animal and it is released back into the wild. Subsequent trappings will determine population size based on the number of marked versus unmarked animals.
79
Fish populations
edit
Similar methods can be used to determine the population of fish; however some key differences arise in the extrapolation of data. Unlike many land animals in-land fish populations are divided into smaller population sizes. Factors such as migration may not be relevant when determining population in a specific locales while more important for others such as the many species of salmon or trout.
80
Monitoring of waterways and isolated bodies of water provide more frequently updated information on the populations in specific areas. This is done using similar methods to the mark-recapture methods of many land animals.
Introduced species
edit
Main articles:
Introduced species
and
Invasive species
The introduction of a foreign species has often caused ecological disturbance, such as when
deer
and
trout
were introduced into Argentina,
81
or when
rabbits were introduced to Australia
and predators were introduced in turn to attempt to control the rabbits.
82
When an introduced species is so successful that its population begins to increase exponentially and causes deleterious effects to farmers, fisheries, or the natural environment, these introduced species are called
invasive species
In the case of the
Mute swan,
Cygnus olor
, their population has rapidly spread across much of North America as well as parts of Canada and western Europe.
83
This species of swan has caused much concern for wildlife management as they damage aquatic vegetation, and harass other waterfowl, displacing them. The population of the Mute swan has seen an average increase of around 10-18% per year which further threatens to impact the areas they inhabit.
84
Management of the species comes in a variety of ways. Similar to overpopulated or invasive species, hunting is one of the most effective methods of population control. Other methods may involve trapping, relocation, or
euthanasia
85
Criticism
edit
In natural ecosystems, populations naturally expand until they reach the
carrying capacity
of the environment; if the resources on which they depend are exhausted, they naturally collapse. According to the
animal rights
movement, calling this an 'overpopulation' is more an ethics question than a scientific fact. Animal rights organisations are commonly critics of ecological systems and wildlife management.
86
Animal rights activists and locals earning income from commercial hunts counter that scientists are outsiders who do not know wildlife issues, and that any slaughter of animals is evil.
Various case studies indicate that use of cattle as '
natural grazers
' in many European nature parks due to absence of hunting, culling or natural predators (such as wolves), may cause an overpopulation because the cattle do not migrate.
citation needed
This has the effect of reducing plant
biodiversity
, as the cattle consume native plants. Because such cattle populations begin to starve and die in the winter as available
forage
drops, this has caused animal rights activists to advocate supplemental feeding, which has the effect of exacerbating the ecological effects, causing
nitrification
and
eutrophication
due to excess faeces,
deforestation
as trees are destroyed, and
biodiversity loss
87
88
Despite the ecological effects of overpopulation, wildlife managers may want such high populations in order to satisfy public enjoyment of seeing wild animals.
47
Others contend that introducing large predators such as lynx and wolves may have similar economic benefits, even if tourists rarely actually catch glimpses of such creatures.
13
In regards to population size, most of the methods used give estimates that vary in accuracy to the actual size and density of the population. Criticisms of theses methods generally fall onto the efficacy of methods used.
89
Human overpopulation
edit
Main article:
Human overpopulation
Overpopulation can result from an increase in births, a decline in
mortality rates
against the background of high fertility rates.
90
91
It is possible for very sparsely populated areas to be overpopulated if the area has a meagre or non-existent capability to sustain life (e.g. a
desert
). Advocates of population moderation cite issues like
quality of life
and risk of starvation and disease and
human pressures on the environment
as a basis to argue against continuing high human population growth and for
population decline
28
92
See also
edit
Overshoot (population)
References
edit
"Overpopulation"
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. Archived from
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25 February
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K. G. Poole. (1994). Characteristics of an Unharvested Lynx Population during a Snowshoe Hare Decline The Journal of Wildlife Management, 58(4), 608-618
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S2CID
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doi
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doi
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JSTOR
3802739
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Flyn, Cal
(20 February 2018).
'People think the deer are lovely. Then they learn more about it': the deer cull dilemma"
The Guardian
. Retrieved
14 November
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Mule Deer: Changing Landscapes, Changing Perspectives: Supplemental Feeding—Just Say No
(PDF)
(Report). Western Association of Fish and Wildlife Agencies Mule Deer Working Group. pp.
25–
26.
Archived
(PDF)
from the original on 29 May 2020 – via
Utah Division of Wildlife Resources
"The cormorant invasion. No assistance from fisheries department"
Queanbeyan Age and Queanbeyan Observer
. 4 April 1919
. Retrieved
7 January
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Russell, Michael (March 2016).
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50 for the Future
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14 November
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2020
Bliss, Dominic (16 September 2019).
"Lynx and wolf may soon be roaming Britain's wild places again. Is it a good idea?"
National Geographic
. Archived from
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on 9 December 2019
. Retrieved
14 November
2020
Connelly, Tony (10 October 2014).
"THE lynx effect could be the answer to deer overpopulation in Scotland"
Deadline
. Retrieved
14 November
2020
Smith, Kenny (10 January 2019).
"Red deer will be frozen out after cull"
Wildlife & Conservation
. Scottish Field
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