Blackcaps are known as northern nightingales, because of their lovely song. Although they look rather different from their close relatives, garden warblers, the song is virtually identical - close enough even to confuse each other. Those with a keen ear can tell the two apart, as the blackcap has longer pauses in its performance. Many blackcaps are migratory, heading to the warm climates of Spain and Africa for the winter. However, some choose to stay in Britain all winter, perhaps because of bird feeders in people's gardens.

Live webcam: Watch live action of garden birds during the RSPB Big Garden Birdwatch weekend.

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