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Male mallard duck overlooking a river - Mølleåen - and keeping an eye on the photographer

Un canard blanc et gris se nettoyant dans l’eau, à Queretaro, au Mexique

Beautiful Male Mallard duck (Anas platyrhynchos) swimming on lake surface in the Netherlands.

A duck on the water

Paradise Shelduck (Tadorna variegata) - waterfowl

close up duck swimming in pond

One dirty mallard duck bird waterfowl closeup after being attacked by geese in Hida no Sato folk village lake pond in Gifu prefecture, Takayama, Japan

Welsh Harlequin Duck standing by the lake

Egyptian geese on the shore of a lake. Birds in natural surroundings. Alopochen aegyptiaca.

A portrait of a black-bellied whistling duck with selective focus at the Ocala Wetland Recharge Park in Ocala, Florida.

Portrait of a musk duck from behind, in a dark green background.

Close up of a Mallard drake.

Muscovy Duck

Two barbary or muscovy ducks beside a lake in a public park in the center of Kandy which is a large city in the central Sri Lanka

Duck sitting on rock

A male mallard seen from above in the boreal forest in autumn.

Mallard duck at Maplewood Mudflats Wild Bird Trust in North Vancouver, British Columbia, Canada.

A male duck (mallard) sitting by the water

The White-faced Whistling Duck is swimming in the river

Muscovy duck on the bank of a pond

Close-up on a domestic Muscovy duck (Cairina moschata domestica) released in the wild.

Beautiful ducks. Duck in nature. Birds in wild. Domestic birds.

Large white duck or goose eating bread in the grass

A duck swims in the dark water of a pond at sunset. Mallard, lat. Anas platyrhynchos, female

Mallard duck in Orta San Giulio, Italy

Mallard duck at Maplewood Mudflats Wild Bird Trust during a spring season in North Vancouver, British Columbia, Canada.

goose in depression

Close-up portrait of a brown mallard duck bird

Mallards are water birds in which females are usually brown, but this female displays a high degree of leucism – it is nearly all white. In leucism, the pigmentation cells that develop from the neural crest are faulty. Similar conditions are (hypopigmentation), where the pigment cells fail only in parts, resulting in a piebald effect; and (albinism). An albino has a lack of only one pigment, melanin. As a result, the melanin layer inside the eye is missing, and albinos have pink 'bloodshot' eyes. The eyes of leucistic animals are pigmented normally, because the melanin within the eyes does not develop from the neural crest. This female is probably the offspring of an all-white mallard female that inhabited this same pond on Wandsworth Common, London.

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