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Katydid with erythirism

Source: Richard Whitby

Erythrism refers to an unusual reddish pigmentation of an animal's fur, hair, skin, feathers, or eggshells. Causes of erythrism include (1) genetic mutations which cause an absence of a normal pigment and/or excessive production of others (2) diet, as in bees feeding on maraschino juice Erythrism in katydids has been occasionally observed. The coloring might be a camouflage that helps some members of the species survive on red plants.

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