
Comparison of egg sizes
Pencil sketch comparing size of humming bird, ostrich, hen, and elephant bird

Coot Fulica atra
Coot Fulica atra

Corncrake Crex crex
Corncrake Crex crex standing on a large stone looking alert with grass at its feet

Cuckoo Cuculus canorus
Cuckoo Cuculus canorus

Curlew Numenius arquata
Curlew Numenius arquata

Dabchick pair Tachybaptus ruficollis
Dabchick or Little grebe pair Tachybaptus ruficollis

Diagram of a duck skeleton
Stylized diagram of the skeelton of a duck

Diagram of Duck Egg development Day 1
Stylized diagram of the development of a duck egg from being laid until after hatching Day one yolk held in place with chalaza, germinal disc where fertilized chick starts to grow

Diagram of Duck Egg development Day 12
Stylized diagram of the development of a duck egg from being laid until after hatching day twelve feathers start to show eye covered with lid claws formed

Diagram of Duck Egg development Day 27
Stylized diagram of the development of a duck egg from being laid until after hatching Day 27 hatchling squashed inside egg ready to hatch, air cell still shows

Diagram of Duck Egg development Day 5
Stylized diagram of the development of a duck egg from being laid until after hatching day five embryo separates from the yolk, blood vessel network grows and branchesm eye starts to get a colour.

Diagram of Duck Egg development Day 8
Stylized diagram of the development of a duck egg from being laid until after hatching day eight blood vessels carry waste and oxygen, eyelids start to cover eye, beak and egg tooth more clear.

Common Goldeneye Bucephala clangula male displaying
Common Goldeneye Bucephala clangula male displaying

Diagram of Duck Egg development Duckling chick hatching out still half in its shell
Stylized diagram of the development of a duck egg from being laid until after hatching duckling hatching half in half out of shell with prominent egg tooth

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

Diagram of Duck Egg development Hatched duckling chick
Stylized diagram of the development of a duck egg from being laid until after hatching hatched duckling chick

Black headed Gull Chroicocephalus ridibundus
Black headed gull Chroicocephalus ridibundus with winter and summer head plumage

Black redstart Phoenicurus ochruros
Black redstart Phoenicurus ochruros view from behind, head slightly cocked

Blackbird Turdus merula
Blackbird Turdus merula

Blue tit Parus caeruleus
Blue-tit Parus caeruleus male on a branch

Blue tit Parus caeruleus and other tits in a tree
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 feeding chicks
Blue tit Parus caeruleus adult feeding chicks inside a bird box

Blue tit Parus caeruleus with bird box
Blue tit Parus caeruleus visiting a bird box

Bohemian Waxwing Bombycilla garrulus
Bohemian Waxwing Bombycilla garrulus perched on a twig of rowan with orange berries