British Trust for Ornithology (BTO)

The British Trust for Ornithology (BTO) is a UK charity that focuses on understanding birds and, in particular, how and why bird populations are changing.

Recent articles by British Trust for Ornithology (BTO)

A blue tit perched on a twig. © Philip Croft/BTO

Blue tit guide: how to identify, what they sound like, and what type of nest box they use

Woodpigeon. © Janne Skinnarla/Getty

Woodpigeon guide: species facts, how to identify, and how they can eat so much

Dunnock. © Tom Cadwallender/BTO

Dunnock guide: species facts, how to identify, and why they are parasitised by cuckoos

House martin, flying with mud in beak for nest building

House martin guide: how to identify, migration and diet

© John Harding/BTO

Tawny owl guide: how to identify, diet and where to see

Adult Barn Swallow in Flight, Castilla y Leon, Spain/Credit: Getty Images

Swallow guide: migration, nesting and where to see

Female pied wagtail. © David Winnard/Getty

Pied wagtail guide: how to identify and species facts

Male blackbird. © Duncan Shaw/Getty

Common blackbird guide: species facts, how to identify males, females and juveniles

Male house sparrow. © Edmund Fellowes/BTO

House sparrow guide: species facts, how to identify, and how to put up a nestbox for them

Robin (Erithacus rubecula) in spring

European robin guide: diet, habitat and species facts

Flying-swift_623-f1abf2d

Discover fascinating facts about swifts

© Graham Catley/BTO

7 bearded tit facts you need to know

© Allan Drewitt/BTO

6 common tern facts you need to know

© Chris Knights/BTO

6 nightjar facts you need to know

Whitethroat - Sylvia communis

6 whitethroat facts you need to know