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Providing evidence to improve practice

Individual study: High success rates of releasing translocated Montagu’s harriers Circus pygargus by hacking at a wetland site in southeast Spain

Published source details

Pomarol M. (1994) Releasing montagu's harrier (Circus pygargus) by the method of hacking. Journal of Raptor Research, 28, 19-22


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

Translocate raptors Bird Conservation

A replicated trial (Pomarol 1994) found that, of 87 Montagu’s harrier Circus pygargus fledglings released at a marshland site in southeast Spain between 1988 and 1992, 83% successfully established in the wild (from 66% of 29 birds released in 1992 to 100% of 13 birds released in 1988-9). A further six chicks died during their first flights at the release site. Birds were taken from recovery centres (mainly chicks rescued from agricultural fields) and agricultural fields in Spanish regions with large harrier populations. They were moved to an enclosure at the release site at 20-30 days old and fed there. Five to eight days later the enclosure was opened and the birds could leave. They were then fed until they reached independence (i.e. stopped returning to be fed), an average of 30-37 days after release, depending on the age at release.