The Chaffinch population has fallen by a quarter in just five years.

Understanding birds

BTO has been at the forefront of bird monitoring and research since we were founded in 1933, and since that time we have accrued a vast body of knowledge. Sharing our understanding of birds is an important part of our work, helping to invigorate and inform our vital volunteer base and inspire the next generation of ornithologists to tackle the conservation challenges of the future.

Barn Owl. Les Foster
Delve deeper

BTO strives to provide a deeper understanding of birds their behaviour. BirdFacts is a one-stop shop for data on British birds.Read our masterclass articles covering one aspect of ornithology in depth. Let us recommend what to read next in our book reviews.

Search for a bird species on BirdFacts

BirdFacts gives in depth information about all of the bird species recorded in the wild in Britain. For each one, BirdFacts is a one stop shop for details of its abundance, distribution, population trends, demographic factors and biometrics, along with other fascinating facts and trivia.

Greenfinch and Chaffinch, Edmund Fellowes

Featured article

Disease in birds - a masterclass

Disease can have serious implications for our wild bird populations, as Wildife Vets from the Zoological Society of London explain.

Collared Dove. Adrian Dancy

Bird identification video

Bird Song Basics - Collard Dove and Wood Pigeon

In this video, Training manager Nick Moran explains the differences between Collared Dove and Woodpigeon songs

Chaffinch. Tom Streeter
Featured appeal

Chaffinch Appeal

The UK breeding population of Chaffinch has fallen by a quarter in just five years - we urgently need your help to understand why.


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