Development of methods for surveying and estimating population of short-eared owls (Asio flammeus) : a report to Scottish Natural Heritage /
Calladine, John(John R.)
Crick, Humphrey Q. P.
Wernham, Chris.
British Trust for Ornithology.
Scottish Natural Heritage (Agency)
Thetford : British Trust for Ornithology,
2008.
Includes bibliographical references.
Short-eared owl