Controlling Wildlife
Did you know that some “pests” are actually native animals that are being persecuted for trying to survive in their natural habitat? And of the “pests” that are not native, most are the descendants of animals who were deliberately introduced, released or abandoned. Some were imported simply to make Australia seem “more like home” to European colonists, and provide a supply of familiar animals that they could hunt for fun. Others were shipped to our shores as sources of labour or were sent overseas with soldiers during wartime, but were abandoned when cars and trucks became more widely available.
Today, these animals are killed in vast numbers using methods that would be illegal if done to any other species. From traps laced with deadly substances, baits injected with poison (a chemical of national security concern according to our government), deadly gases pumped into their underground homes, and viruses intended to eradicate them from existence, unwanted and unwelcome animals across Australia face a threat of an unimaginable scale.
This blog explores the animals that are being targeted (some of which may surprise you, like koalas and emus), the methods used to kill them, and the problems these methods cause – sometimes unexpectedly.
Introduced Species
The Industry
A range of techniques have been developed to limit or control the alleged impacts caused by these animals. The majority of these methods are lethal. Many of them cause significant suffering – even those that may not appear lethal, often present deadly threats to a range of species. Many control programs do not conduct population assessments before or after killing. This limits the ability to provide reliable data on the true effectiveness of lethal control. For example, a Parks Victoria employee explained that “we don’t have a particular target [because] with pest animals it’s not about targets, it’s just about reducing as many as you possibly can” [96]. This attitude translates into a blind reliance on death as the only method of population control and ignores any of the other impacts operations may have.
The current types of control methods used in Australia are fences, barriers, and boundaries, poisoning, and hunting - which are explained below.
Fences, barriers, and boundaries
Until the gold rushes coaxed them elsewhere, many early colonial Australian farmers tended to their flocks as traditional shepherds [97]. When the scale of their operations made this impossible, fences were erected and used in their absence [98]. When farmers realised that new technologies diminished the need for their on-site labour, flocks were “left to fend for themselves”, often in large open paddocks [99].
Originally erected in the 1880s as Australia’s famous “rabbit-proof fence”, today the “Dog Fence” is the largest barrier fence found anywhere in the world [100, 101]. It is primarily used to protect sheep from dingoes [102].
Welfare issues
There has been a range of unintended consequences tied to the use of barrier or exclusion fencing [103]. Each kilometre of the “Dog Fence”, including the roads that run alongside it, occupies an environmental “footprint” of around 2 hectares [104]. RSPCA Australia explains that though there may be some benefits to fencing, including a decrease in predation, “there are also animal welfare impacts on animals on the outside of the fence”, including injury, distress and death caused by starvation, thirst or exposure. They can also “halt natural wildlife movement patterns” and impact biodiversity by reducing the possibility of animals separated by the fence from interacting [105]. Studies have also found that the barrier “has altered the ecosystems of Australia’s outback” and caused significant ecological ripple-effects [106, 107]. The removal of predators, particularly apex predators like the dingo, can lead to rapid increases in herbivores [108]. This dramatically impacts the environment, mostly vegetation and soil quality [109, 110].
Poisoning and viruses
In Australia, poisons are used to kill animals considered to be a threat to agriculture [111]. According to one contemporary account, “humans are using toxic compounds in a useful fashion to control their environment to their benefit” [112]. Do these alleged benefits outweigh the impact they have on the animals and do they really do what we are told they do?
1080 poison
Sodium fluoroacetate, commonly referred to as compound 1080 or simply ‘ten-eighty’, is “one of the most toxic substances” known to exist anywhere in the world [113]. It is so noxious that there is no known antidote [114, 115]. Animal Liberation is part of the Coalition of Australians Against 1080 Poison, and together, we are leading the fight to ban 1080. Learn more about our campaign here.
Welfare issues
Assessments of 1080 have concluded that it causes “severe suffering” [116]. A study published by an RSPCA Australia scientist in the journal Animal Welfare concluded that 1080 “should not be considered a humane poison” [117]. According to the RSPCA, the symptoms of 1080 poisoning include anxiety, frenzied behaviour, hypersensitivity, failure to respond, retching, vomiting, screaming, shaking, uncontrolled urinating or defecating, convulsions, fits, seizures, difficulty breathing, coma and death [118]. Aside from these welfare issues caused by the symptoms of 1080 poisoning, victims may injure themselves during periods of lucidity [119]. For welfare reasons, veterinarian advice is immediate euthanasia because there is nothing that can be done to save the victim once the poison is ingested [120, 121]. Lethal to all air-breathing animals, 1080 poses a threat to any animal unlucky enough to “take the bait” – including companion animals and native species [122, 123, 124]. It also poses a secondary threat to animals who scavenge the bodies of poisoned animals or those who ingest poisoned vomit [125].
PAPP
Due to growing public concern about the use of 1080, new poisons have been developed – one of these is PAPP (para-amino-propiophenone). PAPP was originally investigated as a potential antidote for humans poisoned with cyanide [126]. In 2016, it was developed to kill dingoes and foxes [127] and has since been used to kill cats [128]. It reduces the amount of oxygen in the blood by disrupting the level of haemoglobin and causes unconsciousness and death by lack of oxygen supply to the brain and the heart [129].
Welfare issues
Animals poisoned with PAPP collapse and are eventually incapacitated – it is what the animals endure before they die that is significantly concerning. The time between ingestion and the onset of symptoms can be anywhere between 43 minutes and 15 hours [130]. The symptoms a victim experiences include nausea, vomiting, incoordination, tremors, elevated respiratory and heart rates and haemorrhages from orifices [131]. The time between collapse and insensibility can be anywhere between 30 minutes and 8 hours [132]. During this time, they face a range of potential welfare impacts, including predation from crows, dogs, foxes or other predators, injury, exposure and distress [133].
Strychnine
Strychnine is “very toxic to mammals, birds, and aquatic organisms” [134]. It is used to kill declared “pest” species or inconvenient animals across Australia. Like 1080, there is no known antidote to strychnine poisoning [135]. It functions by locking onto receptors which control the muscles. When one muscle contracts, the corresponding muscle should relax. Strychnine blocks this transmission and causes both to “contract violently” [136]. These muscles include those responsible for respiration, preventing the victim from breathing [137]. Ultimately, death is caused by suffocation or “sheer exhaustion” [138, 139]. In some states, strychnine is used by applying it to a cloth which is then attached to the jaws of traps to kill dingoes (“wild dogs”). It is then ingested by dingoes as they attempt to free themselves of traps [140]. It is also laced in grain baits to kill wild emus [141].
Welfare issues
Similar conclusions have been reached about the use of 1080 and strychnine [142]. It causes “excruciatingly painful spasms” and “violent convulsions” because it interferes with their proper functioning [143]. Studies have concluded that it can take up to 24 hours or longer for a victim to die and “death by strychnine ingestion is inhumane” [144]. The World Organisation for Animal Health (OIE) considers strychnine poisoning to be “unacceptable on animal welfare grounds” [145].
Pindone
Pindone is an anticoagulant used to kill rabbits [146]. It is applied to cereals, oats or carrot baits; the most common baits are carrots and oats [147, 148]. Baits are laid in small piles in areas with known rabbit populations and are replaced every two days until the amount eaten each time drops [149].
Welfare issues
Studies have concluded that pindone poses welfare impacts greater than other poisons currently used to kill rabbits [150]. This conclusion has led reviews to conclude that pindone poisoning causes extreme suffering [151]. Symptoms of pindone poisoning include difficulty moving and breathing, coughing, bruising, bleeding from various bodily orifices, including the nose, mouth, eyes and anus [152, 153, 154]. Symptoms usually appear six days after a bait is eaten, though it can take up to 14 [155]. Rabbits who ingest a sub-lethal dose of pindone may recover, but they experience anaemia, lameness, bruising and bleeding in vital organs, such as the lungs [156].
There is no reliable information about how pindone breaks down in poisoned animals and it may pose a secondary threat to scavengers who consume their carcasses [157]. Pindone is an anticoagulant, which interferes with the ability of the body to clot blood, a range of other animals are at risk during a baiting program [158, 159]. During the initial baiting period, these include animals who may take the baits themselves. Others can be killed if they scavenge the carcass of an animal poisoned during the first baiting phase [160].
Gassing, warren ripping, and explosives
Unlike other techniques which are used to kill a wide range of species, gassing, warren ripping, and explosives are usually reserved for rabbits. Occasionally den fumigation and ripping is used to kill foxes [161]. Gassing is described as “the most effective method of reducing rabbit numbers where burrows are accessible” [162]. During the 1960s, exhaust fumes from cars were fed into rabbit warrens [163]. This technique, referred to as “fumigation”, is used to kill rabbits across Australia today using different techniques [164]. Modern techniques use carbon monoxide or phosphine gas which disrupt the central nervous system and respiratory function [165]. “Ripping” refers to using heavy machinery, such as tractors, to destroy the underground homes (dens) of rabbits or foxes [166]. Sometimes warrens or dens are destroyed using explosives [167].
Welfare issues
Gassing using various fumes causes significant suffering [168]. Blasting with explosives is considered “more humane” if it causes complete collapse even though there have been no studies to “formally assess the effectiveness or humaneness” of the method [169, 170]. If the explosives are not placed in a position which causes complete collapse, some rabbits can become trapped in partially destroyed tunnels and suffocate or die from “blast-related injuries that were not immediately lethal” [171].
Hunting
There are three main groups of animals hunted in NSW; introduced game species, native birds, and “pest” or “feral” animals. Hunters use a range of weapons, including firearms, bows and knives [172]. In most states, it is legal to hunt some species with dogs (“pig dogging”) [173]. Across the country, many millions of animals are killed in government and private control programs each year.
Shooting
There are two main types of shooting practiced across Australia: ground and aerial. Ground shooting is widely used across the country to kill a range of species, including donkeys, camels, goats, horses, pigs, foxes, birds, rabbits, deer and dingoes [174, 175]. It is carried out by official government control officers, landholders and professional or licenced shooters across the country [176]. Aerial shooting involves the use of firearms from helicopters. It is most often used to kill horses, donkeys, goats, camels, and pigs after other methods, such as trapping and mustering, have been applied [177].
Recreational hunting
Recreational hunting is killing animals for “sport” or enjoyment. This is usually done by firearm, arrow, or knife [178]. Bowhunting is legal in NSW and Victoria [179, 180]. Knives are usually used to kill animals who are already incapacitated, such as pigs taken down by dogs in “pig-dogging” [181]. Recreational hunting is usually justified by claims that it removes unwanted wildlife, including “pest” animals from the environment and aids or enhances other conservation efforts [182, 183, 184, 185]. Studies have found “insufficient evidence to support or disprove arguments that contemporary recreational hunting programs are effective at controlling introduced mammal populations” and that current programs “offer little” to prove its value as a control tool [186].
Welfare issues
Shots to the “kill zone” (i.e. vital areas of the body which cause immediate death) are often considered humane as they result in rapid unconsciousness and death [187, 188]. The kill zone area is not the same for every animal [189, 190, 191]. The size of the target required to effectively and immediately kill most animals is “not much larger in size” than a small apple [192]. There are many difficulties associated with ensuring an accurate shot is made [193]. Under most policies, wounded animals must be quickly located and killed [194]. Some animals, however, can travel for a long distance after being shot before finally dying [195].
“Pig dogging”
“Pig dogging” is a form of hunting which uses dogs to assist in finding, pursuing and restraining wild pigs [196]. It is legal in NSW, though there are some conditions in other states [197, 198]. Though it is a controversial method, it is described as “a popular recreational and commercial activity” by the NSW Department of Primary Industries (DPI) [199]. Video has been captured of piglets being released by hunters, in an effort to ensure their presence for upcoming hunting expeditions [200]. Despite being illegal, this evidence directly contradicts claims repeatedly made by hunters that their killing is an act of conservation [201]. Support Animal Liberation’s campaign to ban pig dogging, here.
Welfare issues
Under NSW law a person must not “cause, procure, permit, encourage or incite a fight in which one or more animals are pitted against another animal or animals” [202]. Despite this, pig dogging remains legal. Dogs used when hunting pigs can suffer “severe injuries” [203]. Sometimes the wounds they sustain while attempting to take the pigs down are fatal. Other injuries are treated by the hunters instead of providing them with proper veterinary care [204]. Some studies have found that dogs intended as “pig-dogs” are bred “surplus to requirements” in a manner similar to overbreeding in other entertainment industries, such as greyhound racing [205]. Like greyhounds, dogs that are not considered suitable because of their nature (in this case those incompatible with killing pigs) are killed as “wastage” [206]. If they are suitable and they are used to kill pigs, they can be branded as a threat or a “future danger to the public or [other] animals” and be killed (“euthanised”) [207].
Hunt clubs and “fox drives”
Though hunting foxes on horseback with dogs was outlawed in Scotland in 2002 and banned in England and Wales in 2004, it is still legal in some parts of Australia [208, 209, 210, 211, 212]. Though rare and dwindling in numbers, some groups which practice “fox drives” have existed in Australia for over 160 years [213, 214, 215]. These groups “flush out” foxes who are then followed by a pack of hunters, sometimes on horseback [216]. These are known as “fox drives”. The foxes can be chased by dogs or a second group of hunters who “drive” them to hunters armed with firearms, usually shotguns [217]. When using people to scare foxes from their hiding spots, one group of hunters assemble in a line approximately 50 metres apart. Another group, known as “beaters”, are positioned in a strategic area so that when the foxes attempt to escape they “drive” them towards the armed hunters [218].
Welfare issues
According to the Australian RSPCA, recreational hunting causes “inevitable pain and suffering” and it “is not an effective form of pest management” [219]. Their policy states that “recreational hunting or the act of stalking or pursuing an animal and then killing it for sport cannot be justified” despite any “skills, knowledge or motivation” the hunter may have [220]. Our recent blog on kangaroos showed that non-commercial or recreational hunting leads to far more cruelty and a far higher degree of inhumane killing due to the lack of regulation and competency testing required. The same may be said of the hunting of introduced or “pest” animal species. In some states, such as NSW, you do not need to hold such a licence if you intend to kill “feral” or “pest” animals. These animals include foxes, as well as rabbits, deer, goats, rabbits, cats and “wild dogs” (dingoes) [203].
Trapping
There are no statistics on the number of animals trapped in Australia each year. Usually, an animal is trapped and then shot in the head with a rifle or other firearm [222]. The traps most commonly used are cage or leg and foot-hold traps. Cage traps use wire mesh and come in a variety of sizes depending on the animal intended for trapping [223]. They have a spring door which is triggered by a plate or hook mechanism which shuts the entry once an animal sets foot inside [224]. They can be disguised with sticks, leaves or other organic materials found nearby the site and are usually left outdoors so that they smell “natural” [225]. Most policies dictate that traps must be regularly checked though it is rarely if ever governed or enforced [226]. Because they may be set in areas in remote or rural Australia, the regular checking of traps is considered impossible by the RSPCA [227].
Welfare issues
Trapping results in severe physical and psychological suffering [228]. Leg-hold traps can cause severe injury to target or non-target animals, including swelling, lacerations, and dislocations [229]. Animals often inflict injuries on their feet and legs attempting to escape and cause damage to their teeth, lips and gums from chewing on the jaws of the trap [220, 221]. The victim can also be vulnerable to predation by other animals or succumb to exposure if left without food, water or shelter [222].
Bounty programs
Bounty programs promote the killing of unwanted animals and offer cash rewards when evidence is presented as proof. Some local Councils still offer up to $25 per dingo or fox scalp [223, 224]. Some have started offering bounties for cat scalps [225]. The reward ranges from up to $40 to $120 for a dingo or fox scalp and as little as $10 for a cat scalp [226, 227, 228]. Between 2011 and 2017, over half a million fox scalps (like those in the photo below) were collected in Victoria [229]. In less than six months, over 60,000 fox scalps can be collected by the Victorian government [230].
Welfare issues
Bounty hunters often use “inhumane and non-selective killing methods” which cause animals significant suffering and protracted deaths [231]. Often, the bounty systems have little effect [232, 233, 234]. Australian studies have found that a bounty across Victoria “was not considered to cause a useful or lasting reduction in fox numbers” despite over 200,000 foxes being killed [235]. There have been examples, however, where bounties played a role in extinctions. For example, the extinction of the Tasmanian tiger was “caused in larger part by farmers and bounty hunters” [236]. RSPCA Australia maintains that “bounty schemes should be discouraged” [237]. International studies have found that they actually “compromise wildlife conservation efforts” [238].
Alternatives
For some time it has been widely acknowledged that over-reliance or dependency on one control technique or strategy, such as poison baiting using 1080, is “unwise” [239]. There is a growing push for the development of humane alternatives [240, 241]. Experts ask why we continue to invest billions of dollars into using the same techniques we have used for decades “when a more proactive and natural alternative exists” [242]. Alternatives depend on a range of factors. In some instances, the solution is nature itself. It is argued that “the dingo is in fact a sorely under-utilised weapon in our feral-animal arsenal” [243]. Experts cite the lower levels of other animals, particularly smaller introduced predators like foxes and cats, in areas where dingoes are abundant [244, 245].
In other situations, we can implement Trap-Neuter-Release, or sterilisation programs [246]. According to Tatiana Samoylova, an associate research professor in Auburn’s College of Veterinary Medicine, “current control programs that focus on wild pig eradication via trapping and shooting are expensive and ineffective. Contraceptive vaccines can, over time, significantly reduce populations to manageable numbers and are more acceptable means of population control to the general public” [247].
Animal Liberation’s Stance
Animal Liberation promotes the adoption of the 7 principles of ethical wildlife management. These principles were developed in response to opposition to current control techniques and the fact that “commonly used control actions are inhumane, ineffective or not based on scientific evidence” [248].
What can you do?
After 60+ years of deadly and indiscriminate control methods, it is clear that killing isn’t a solution. Until we learn to coexist with wild animals, many more will continue to die painful, avoidable and shocking deaths by bullets, baits or any combination of the methods outlined in this blog.
You can help us fight for the animals impacted by “pest control” programs in the following ways:
Being vocal and sharing content about the plight of these animals to help raise awareness;
Signing the petition for an urgent review of the use of 1080 poison, becoming a member of the Coalition of Australians Against 1080 Poison, and/or starting your own local chapter of the Coalition in your community. More at www.ban1080.org.au.
Support Animal Liberation's call for an Independent Office of Animal Welfare;
Become a regular supporter of Animal Liberation and help us create a kinder world for animals;
Refusing to participate in hunting activities and investigating predator-friendly farming practices such as the use of novel deterrents such as fladry (suspended flags), for example.