The causal reason is that carotenoid pigments, which the boobies get through their diet, are concentrated in their feet, making them appear blue in colour The concentration of these pigments determines the strength of the colour of the feet, with higher concentrations making the feet a more intense colour of blue. What color are blue-footed … Read more
Partially albino, or leukistic, birds are rare, occurring in about one in every 1,800 individuals , according to the The Audubon Society Encyclopedia of North American Birds. Their catchy coats are the result of a recessive gene that reduces the production of melanin, a pigment which gives feathers color and strength. Where do white eagles … Read more
White-tailed eagles in the UK White-tailed eagles became extinct in the UK as a result of extensive habitat change combined, particularly in the 19th century, with persecution. Before their recent re-introduction, the birds last bred in England and Wales in the 1830s, in Ireland in 1898 and in Scotland in 1916. Is a white-tailed eagle … Read more