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Providing evidence to improve practice

Individual study: American kestrels Falco sparverius use nest boxes provided on farms in Iowa, USA

Published source details

Craft R.A. & Craft K.P. (1996) Use of free ranging American kestrels and nest boxes for contaminant risk assessment sampling: a field application. Journal of Raptor Research, 30, 207-212


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

Provide artificial nesting sites for falcons Bird Conservation

A replicated trial at nine mixed agricultural sites in Iowa, USA (Craft & Craft 1996), found that American kestrels Falco sparverius occupied 66% of 56 nest boxes for at least one year between 1989 and 1992, with a maximum of 42% occupied in any one year. Clutches contained an average of 4.4 eggs (49 clutches) and 4.2 chicks fledged on average from each successful box (33 boxes, average of 2.7 chicks/box). These values are similar to previously recorded productivities for American kestrels. Four wooden nest boxes were erected in 1988-9 at each site on pylons, windmills, barns or wooden posts. An additional two PVC boxes were erected in 1990 at each site, plus a final two at one of the sites.