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Providing evidence to improve practice

Individual study: Review of releases of raptors, owls and vultures from a rehabilitation centre in Minnesota, USA

Published source details

Duke G.E., Redig P.T. & Jones W. (1981) Recoveries and resightings of released rehabilitated raptors. Raptor Research, 15, 97-107

This study is summarised as evidence for the intervention(s) shown on the right. The icon shows which synopsis it is relevant to.

Rehabilitation of injured and treated birds Bird Conservation

A replicated study of raptors, owls and vultures brought into a rehabilitation centre in Minnesota, USA, between 1974 and 1980 (Duke et al. 1981), found that 452 of 1133 raptors (40%) brought to the centre were released back into the wild. Of these, 2.4% were recovered (i.e. were injured or killed), with 55% of these recoveries being within six weeks of release. Release rates for owls were lower (175 of 551 birds, 32%) and a higher proportion of owls (8%) were recovered after release. However, only 21% of these were within six weeks of release. Two of nine turkey vultures Cathartes aura released and neither was recovered. Size of bird did not seem to affect possibility of release and the severity of the original injury did not appear to affect post-release survival.