countryside

Bird bone cross section showing cross bracing for strength and hollow structure

Stylized diagram of the internal organs and anatomy of a duck within a pen outline

Common Goldeneye Bucephala clangula male displaying

Common kingfisher Alcedo atthis with minnow in its beak, perched on a branch

Coot Fulica atra

Archeopteryx skeleton

Barn owl Tyto alba peering out from barn rafters

Black Casqued Hornbill Ceratogymna atrata

Black headed gull Chroicocephalus ridibundus with winter and summer head plumage

Blackbird Turdus merula

Blue-tit Parus caeruleus male on a branch

Blue tit Parus caeruleus, Coal tit, Long tailed tit, and great tits in a Scots pine tree with cowslip and snakeshead fritillary growing underneath

Blue tit Parus caeruleus adult feeding chicks inside a bird box

Blue tit Parus caeruleus visiting a bird box

Bullfinch Pyrrhula pyrrhula male

Buzzard Buteo buteo at rest on a branch

Canada goose Branta canadensis

Chaffinch Fringilla coelebs male in amongst grasses

Archeopteryx reconstruction