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)

Robin (Erithacus rubecula) in spring

European robin guide: diet, habitat and species facts

A long-tailed tit on a branch. © Linda Lyon/Getty

Long-tailed tit guide: how to identify, what they sound like, and what to feed them

Blue tit perched on the branch of a spring flowering crab apple tree

British garden birds guide: how to identify different species and attract them to your garden

Coal tit perched on a twig. © David Waistell/BTO

Coal tit guide: how to identify, what they eat, and when they’re seen in gardens

Great tit perched on a branch. © Sarah Kelman/BTO

Great tit guide: how to identify by sight and call, and what they feed on

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

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

Flying-swift_623-f1abf2d

Discover fascinating facts about swifts

© Graham Catley/BTO

7 bearded tit facts you need to know