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

An orange-billed duck standing in a grassy outdoor environment

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

Welsh Harlequin Duck standing by the lake

Large white heavy duck also known America Pekin Duck, Long Island Duck, Pekin or Aylesbury Duck, Anas platyrhynchos domesticus

A duck on the water

The menagerie, the zoo of the plant garden. View of a couple of mandarin ducks in the large aviary

close up duck swimming in pond

close up of muscovy duck

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

Common shelduck (Tadorna tadorna) waterfowl bird resting in grass in tidal marsh wetland at Wadden sea in the Netherlands. Wildlife scene in nature.

Brown duck walking on grass. Pacific Black Duck, Anas supersiliosa

Male Northern Pintail.

Large white duck or goose eating bread in the grass

Northern Shoveler swimming in the water

duck

Photo of a duck by the river

Ducks in the park feeding and flying at the Esquimalt Lagoon in Victoria, BC.

Paradise Shelduck (Tadorna variegata) - waterfowl

Maned duck, also known as Australian wood duck, in the morning sun.

Farmyard goose preening on the mill pond

Portrait of male Mallard Duck on lake

Close up of a White Muscovy Duck free range in grass grass

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.

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

White duck swimming on a lake

Ross's Goose (anser rossii) swimming in a murky pond

Male Pochard duck on the Lake beside the Ridley Hide on Gosforth Park Nature Reserve with a full reflection.

The Smew (Mergellus albellus), a species of duck.

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