The occurrence of biannual primary moult in passerines

Author(s): Prŷs-Jones, R.P.

Published: January 1991

Journal: Bulletin of the British Ornithologists' Club Volume: 111

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The training will consist of two weekly online sessions of about 2 hours each, complemented by supported self-study exercises which will be provided after each session. The training will be run by BTO staff members Nick...

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It may still feel like winter but for some species, the increasing temperatures and lengthening days have already kick-started spring migration, with birds starting to arrive and depart across Britain and Ireland.

The occurrence of biannual primary moult in passerines

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