Mystery photographs

01 October 1977
Comments Main paper Until the differences between Long-eared Asio otus and Short-eared Owls A. flammeus in the field were analysed by A. H. Davis and Robin Prytherch [Brit. Birds 69: 281-287, plate 49), flight identification of these species was seldom attempted, or a day...
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Protocalliphora in birds nests

01 July 1954
Comments Main paper DIPTEROUS flies of the genus Protocalliphora belong- to the Calliphoridae, a family in which most species are carrion-feeders. In this genus the larvae are ecto-parasites of nestling birds. The adult flies lay eggs in birds' nests and when the larvae hatc...
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