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A report to the Labour Animal Welfare Society May 2021 A review of the animal welfare, public health, and environmental, ecological and conservation implications of rearing, releasing and shooting non-native gamebirds in Britain Professor Stephen Harris BSc PhD DSc A REPORT TO THE LABOUR ANIMAL WELFARE SOCIETY A review of the animal welfare, public health, and environmental, ecological and conservation implications of rearing, releasing and shooting non-native gamebirds in Britain A report to the Labour Animal Welfare Society Professor Stephen Harris BSc PhD DSc May 2021 NON-NATIVE GAMEBIRDS IN BRITAIN - A REVIEW A REPORT TO THE LABOUR ANIMAL WELFARE SOCIETY Instructions Contents I was asked to review the scientific I was told that:- Summary of the key points 1 evidence on:- l I should identify any animal welfare concerns Sources of information 5 and potential effects on wildlife and public 1. The potential welfare and public health issues Introduction 6 associated with rearing, releasing and shooting health large numbers of non-native gamebirds in l I should identify the actual or potential The legal status of non-native gamebirds in Britain 7 Britain direct and indirect effects of activities Good-practice guidelines for gamebird shooting 10 2. Whether rearing and releasing large numbers associated with rearing, releasing and shooting gamebirds, and the distances of non-native gamebirds in Britain, and How many foxes are there in Britain? 12 associated predator-control activities, have an that may be required for any precautionary actions, prohibitions or mitigation impact on the numbers of different species How much food do foxes require? 16 of avian and mammalian predators, and the l I should consider any potential environmental, character and extent of any possible species ecological and/or conservation impacts of The number of pheasants and red-legged partridges 17 interactions widespread supplementary feeding by the reared, released and shot in Britain 3. Whether rearing and releasing large numbers gamebird-shooting industry The biomass of the surplus non-native gamebirds 20 of non-native gamebirds in Britain affects the • I should evaluate Natural England’s gamebird released each year numbers of foxes and other predatory species release rapid assessment and identify of birds and mammals, and the spatial scale of potential omissions and oversights The impact of predation on gamebirds on fox 23 these influences numbers in Britain l It is of particular importance to consider 4. Whether rearing and releasing large numbers the potential impacts of widespread killing The impact of scavenging on fox numbers 25 of non-native gamebirds in Britain has an of foxes on fox population dynamics, influence on the population dynamics of species interactions and food webs more The impact of carrion on ecosystem functioning 27 foxes and other predators, and the spatial generally scale of these influences l It is my decision as to what evidence The role of scavenging in the spread of disease 28 5. The potential impacts of releasing large I wished to include in my review and, The use of antibiotics by the gamebird industry 29 numbers of non-native gamebirds in Britain while the review relates particularly to on the predation pressure on species of the situation in Britain, I was free to refer The use of other pharmaceuticals by the gamebird industry 32 conservation concern, particularly ground- to any studies from other countries that nesting birds, and the scale of these impacts I considered to be relevant The environmental impact of the lead shot used by 33 6. Other potential environmental, ecological the gamebird-shooting industry and/or conservation impacts of rearing and releasing large numbers of non-native The impact on wildlife posed by the use of dogs on 36 gamebirds in Britain gamebird-shooting estates Dispersal and food requirements of released gamebirds 37 Food availability, red fox population dynamics and the 39 conservation benefits of widespread predator control Conclusions 43 References 48 NON-NATIVE GAMEBIRDS IN BRITAIN - A REVIEW AA REPORT REPORT TO TO THE THE LABOUR LABOUR ANIMAL ANIMAL WELFARE WELFARE SOCIETY SOCIETY Summary of the key points I review the environmental, ecological and no evidence that existing codes of practice are conservation impacts of rearing, releasing and addressing these welfare issues. shooting non-native gamebirds in Britain, and the 4. There are significant welfare issues associated wider impacts of the gamebird-shooting industry with the widespread killing of possibly/probably on animal welfare and public health. I show that:- milions of predominantly native birds and 1. Each year the gamebird-shooting industry mammals each year to protect the commercial releases 47 million ring-necked pheasants and interests of the gamebird-shooting industry. 10 million red-legged partridges (both non- These include the widespread use of poisons, native species) to provide an opportunity for snares, traps and different forms of shooting to participants to pay to kill large numbers of kill native predators and scavengers, all of which gamebirds in a single day. While the number of have significant, and well-established, welfare gamebirds released each year has increased, the concerns. The ecological impacts of killing so proportion that are shot has been declining. The many native predators and scavengers have not density of pheasants reared, released and shot been quantified but are likely to be substantial. in Britain, and in particular in England, greatly 5. It is anomalous that released non-native exceeds that of any other European country. The gamebirds have a close season while a wide quality of the experience when shooting driven range of native predators and scavengers are gamebirds in Britain appears to be equated with routinely killed during their breeding season. the number of birds that are killed. Financial Recognising and respecting animal sentience interests override the environmental, ecological, in Britain is long overdue, whether or not a conservation and animal welfare and public species is a predator and/or scavenger. health impacts of the industry. 6. The only stratified survey of fox numbers in 2. The legal status of ring-necked pheasants and Britain was undertaken at the turn of the century. Many of the pheasants shot each year are surplus to requirements red-legged partridges in Britain is confused, and Since then, a long-term monitoring scheme run the level of protection they receive is inconsistent by the British Trust for Ornithology has shown with their status as an introduced species. While that the number of foxes in Britain has been red-legged partridges (i.e., gamebirds that are 120,000 foxes for a year, although it is not possible the gamebird-shooting industry portrays declining, possibly because of an even greater reared and released but not shot) enter the to determine the proportion of the available pheasants and red-legged partridges as decrease in the numbers of rabbits due to rabbit ecosystem each year. This has widespread gamebird carrion that is consumed by foxes, naturalised, there is no evidence that either haemorrhagic disease. Rabbits were a major environmental, ecological and conservation how much is consumed by other scavengers, species would survive in Britain without food source for foxes in Britain during the second impacts, and has a substantial impact on the and how much decomposes. The number of extensive releases each year and a variety of half of last century. The spread of sarcoptic numbers of predators and scavengers in Britain. foxes supported by predating and/or scavenging other interventions designed to support released non-native gamebirds has increased 10-fold mange may also have contributed to the decline 8. A number of studies have shown that 40% of gamebirds. Both ring-necked pheasants and since the turn of the century. in fox numbers. The scientific evidence does released pheasants and red-legged partridges red-legged partridges are non-native species, not support claims that fox numbers have been (and possibly more) are predated by foxes, i.e., 9. Gamebird shooting is widespread in Britain and and a review of the legal protection they are increasing or that fox densities in Britain are of the 35.8 million kg total biomass of surplus its environmental, ecological and conservation afforded in Britain is long overdue. higher than the rest of Europe. gamebirds released in Britain each year, around impacts affect much, if not all, of lowland Britain. 3. There are a number of significant welfare issues 7. The gamebird-shooting industry produces 14.3 million kg is predated by foxes. Since an The ‘surplus’ gamebirds (i.e., easy-to-catch prey associated with rearing and shooting gamebirds substantial amounts of surplus food for predators/ adult fox requires 180 kg of meat to support and carrion) reared and released each year by in Britain. These include: high predation rates scavengers in the form of captive-reared birds itself for a year, data from the gamebird-shooting the gamebird-shooting industry are available while poults are in their release pens; high levels that are easy to catch and kill, and carcasses of industry show that predation on pheasants and throughout much of the year. Food availability is of mortality on the roads following release; high gamebirds that die of disease, accidents, or are red-legged partridges provides enough food to a major factor that determines fox numbers, and levels of disease; high levels of wounding; and wounded or killed by shooters but not recovered. support 80,000 foxes for a full year. The availability there would be significantly fewer foxes in Britain the number of wounded gamebirds that are not Industry figures show that 33.2 million kg of of carrion from gamebirds that die of other if the gamebird-shooting industry stopped recovered. Self-regulation by the gamebird- surplus pheasants and 2.6 million kg of surplus causes could support anything up to a further providing the supplementary food that supports shooting industry is ineffective, and there is 1 2 NON-NATIVE GAMEBIRDS IN BRITAIN - A REVIEW A REPORT TO THE LABOUR ANIMAL WELFARE SOCIETY large numbers of predators and scavengers.