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Yorkshire Wildlife Trust Archive
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Common Bird Census

The Common Bird Census was introduced in 1962 as the first scheme by the British Trust for Ornithology (BTO) to monitor population trends across common breeding bird species in the UK. Initially it sought to provide vital information on British fa...

Breeding Bird Surveys

The Breeding Birds Survey was launched nationally in 1994, following two years of development and pilot schemes. It is designed to overcome limitations of the Common Birds Census by improving the geographical representation of species.

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