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Nos estimations indiquent que de 2 7 % des oiseaux dans le sud du Canada sont tus par les chats chaque anne.

Mme en considrant lestimation la plus prudente, la prdation par les chats domestiques est probablement la cause de mortalit doiseaux lie aux humains la plus importante au Canada.

2004), primarily on oceanic islands where cats have been reported to kill in excess of a million seabirds per year (Pascal 1980, Chapuis et al. And there is increasing evidence of impacts on mainland bird populations, at least at a local scale (Churcher and Lawton 1987, Crooks and Soulé 1999, Hawkins et al. 1997, Hudon 1999, COSEWIC 2004a) it is clear that birds and bird nests are preyed upon by cats in Canada; the challenge is understanding the magnitude of that kill and its importance to bird populations in Canada. House cats (Felis catus) are estimated to kill large numbers of birds in countries and regions where this source of bird mortality has been studied, for example 1-4 billion birds killed per year in the United States (Dauphine and Cooper 2009, Loss et al. Notably, there has been very little rigorous study of cat predation on birds or other wildlife in Canada, even though Guthrie (2009) speculated that more than 165 million birds are killed per year by free-roaming cats in Canada. Dunn and Tessaglia (1994) summarized bird kills reported by feeder-watchers across the U. and southern Canada: cats were responsible for 29% of bird kills for which the predator was identified, ranking second to the Sharp-shinned Hawk (Accipiter striatus). A questionnaire approach is currently being used to document numbers of dead birds returned by pet cats in Edmonton, Alberta (E. 2013), 27 million in spring and summer in Great Britain (Woods et al. Cats can substantially reduce bird populations in some circumstances. Toner (1956) studied prey returns by two pet cats on a farm in Haliburton, Ontario; only a few songbirds were recorded among hundreds of prey retrieved. Bayne, personal communication); a total of 797 birds had been reported from 494 households with cats through 2010. The specific formulae used were: where n PC is the number of pet cats in Canada, p RP is the proportion of pet cats that are rural, p Od is the proportion of pet cats with at least some access to the outdoors, Bp U (or Bp R) is the average number of birds returned to owners per outdoor urban (or rural) pet cat, Adjust is a multiplier to convert birds returned and detected by owners to birds killed by pets, n FC is the number of feral cats in Canada, and Kp F is the average number of birds killed per feral cat. Based on existing data and rationale provided below, a plausible range of values was established (Table 1) for each parameter in the formulae above.

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