Development of methods for surveying and estimating population size of Short-eared Owls
Author(s): Calladine, J., Crick, H. & Wernham, C.
Published: January 2005 Issue No.: 394 Pages: 29pp
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One bird, twelve journeys, 60 000 miles and invaluable scientific data: PJ the Cuckoo has left an incredible legacy.
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