Susceptibility to Predation Varies with Body Mass, Foraging Niche, and Anti-Predator Responses among Bird Species

Predation is a major source of mortality for many avian species. Species that face more predators, and those with less effective anti-predator responses, are presumably likely to die from predation over time. rate, as measure susceptibility predation, difficult in the field. Radio-tracking studies, however, allow researchers determine time cause death marked individuals, making it possible estimate rate. I used estimates rates large number published radio-tracking studies birds assess phylogenetic framework effect several potential determinants. obtained 393 129 were lower areas fewer such islands aquatic habitats, species larger The rate was also prey forage flocks. provide unique opportunity overall Broadening range habitats involved will help further elucidate factors affect predation.