endothermic

Mallard Anas platyrhynchos duckling in the process of hatching from its egg, half in half our and exhausted with wet feathers

Mallard duck Anas platyrhynchos duckling, quick pencil sketch showing spiky fluffy feathers

Marabou stork Leptoptilos crumenifer with large beak and white neck feathers, and lots of exposed blueish pink skin on the head and loose fleshy wattles under the neck

Marsh tit Poecile palustris and Willow tit Poecile montanus illustrations next to each other for easy comparison of these similar species

Meadow pipit Anthus pratensis cut to white

Dipper eating aquatic invertebrate

Group of domestic ducks and geese including the Muscovy duck

Edier duck Somateria mollissima pair with chicks in rainy coastal scene male swimming

Goldcrest Regulus regulus upside down on some dried twigs showing the yellow head crest clearly

Golden eagle Aquila chrysaetos

Goldfinch Carduelis carduelis pair perched on teasels

Goosander or Common merganser Mergus merganser on a lake with sundew, rocks and a beach in the foreground, scrubby vegetation behind, set in northern Wales uplands.

Goshawk Accipiter gentilis looking fierce cut to white

Great crested grebe Podiceps cristatus male with erect crest

Great spotted woodpecker Dendrocopos major on side of a tree, ready to drill for insects

Great Tit Parus major on a tree branch with grasses behind

Greater flamingo Phoenicopterus roseus standing on one leg cut to white

Green woodpecker Picus viridis perched on a tree trunk

Grey heron Ardea cinerea quick sketch, standing on one leg in a river

Grey heron Ardea cinerea wading ankle deep in a river with reeds behind

Grey partridge Perdix perdix cut to white with one foot raised

Grey wagtail Motacilla cinerea breeding male stood on a mossy stone in a stream

Hen Gallus gallus domesticus egg sitting in a green field with meadow flowers and butterflies, used for packaging

Herring gull Larus argentatus eating a chip from the road in a seaside urban setting