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Providing evidence to improve practice

Individual study: Hand-reared American kestrels Falco sparverius grow more slowly and reach smaller sizes than captive, parent-reared birds

Published source details

Bird D.M. & Clark R.G. (1983) Growth of body components in parent-and hand-reared captive kestrels. Raptor Research, 17, 77-84


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

Artificially incubate and hand-rear raptors in captivity Bird Conservation

A replicated and controlled ex situ study in a research centre in Quebec, Canada (Bird & Clark 1983), found that 25 hand-reared American kestrels Falco sparverius grew more slowly than 19 parent-reared birds, also in captivity. Parent-reared birds also achieved greater body sizes than hand-reared birds (predicted weight of hand-reared birds of 119-130 g vs. 133-138 for parent-reared). Hand-reared birds were fed until sated four times a day, whilst parent birds were provided with food in excess. Survival and reproductive output were not measured in this study.