Leucistic Animals

Leucism

Leucism (a.k.a. achromia) is a state of reduced pigmentation that can occur in individuals of almost all species of animals. The animals skin may appear pink, its fur anywhere from beige to blond to pure white. However leucistic animals have normally colored eyes. Leucsm is produce by the expression of a single recessive gene. Partial expression of leucism can lead to an animal having a pied or spotted appearance. By contrast albinism if a complete lack of pigmentation.

Overall leucism tends to be a disadvantage to an animal. They lose the function advantages of coat marking such as camouflage. Leucistic zebra finch chicks lack the 'gape marking' that encourages the parents to feed them, leading the parents to favr normally colored chick when food sources are limited.

See also


Mammals

 

Elephant Seals

Perhaps the first leucistic elepphant seal reported was seen on Prion Island (South Georgia) in 2003.

In 2004 another presumed leucistic pale-colored female was sighted at Marion Island.

The young female elepant seal pictured to the right was spotted in 2009.

Giraffe

Examples of leucistic giraffes are relatively rare. (As photographed in Tanzania, 2005; South Africa, 2009)

Leucistic giraffes are also held in several zoos including Milwaukee Zoo.

 Hippopotamus

This young hippo was photographed on the banks of the Mara River in 2010.

Lions

White lions are described being first sighted variously in 1928 or the 1940s. They are popular exhibits in zoos, but rarely found in the wild. Some groups are advocating protection of white lions in the wild, but they are not recognised as a species and so cannot be given most designations of protection separate from other color morphs.

Otters

A white otter, which may even be albino was photographed in the wild in Scotland in 2008.

Two leucistic otters were born in a zoo in 2010.

 Tigers

White tigers (who retain their black stripes) are not a separate species, but another case of leucistic coloring.

Source

Birds

In birds leucism is defined as a lack (or partial lack) of eumelanin and phaomelanin in the feathers, although the soft tissues are often at least partially pigmented.

Geese

A number of the barnacle geese of the Solway Firth (United Kingdom) display leucanism.

 

Kiwi

There have been a number of white kiwi such as Manukura (2011) and Mauriora (2011).

Penguins

This Adele penguin (see right, native of Antartica, sighted 2008) is one of many penguins from a range of species that display leucism.

Sandhill Crane

This leucistic sandhill crane was photographed in 2008 at Ewing Bottoms, Indiana.

Other Birds

Other examples of leucistic birds include:


Source

Partial Leucism

Leucistic animals retain pigment to different degrees. Partial leucism can lead to specific areas of the body being white and others retain full normall coloration such as with the crow shown right, or this squirrel who is whie colored only on the tail.

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JoyLevine profile image

JoyLevine 3 years ago

Nicely written article. I've always been intrigued with leucism. I once knew a leucistic red tailed hawk in my neighborhood. Where I live now there is a beautiful leucistic female mallard.

Thanks for a lovely article.

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    References:

    • van Grouw H (2006). Not every white bird is an albino: sense and nonsense about colour aberrations in birds. Dutch Birding [pdf]

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