![]() ![]() The following species with a high frequency of abnormal plumages include the house sparrows ( Passer domesticus), jackdaws ( Corvus monedula), and carrion crows ( Corvus corone). In the survey, Blackbirds ( Turdus merula) exhibited abnormal plumages more frequently than all the 58 species covered in the survey. Across species, leucism and albinism occur at varying rates Thus, of 100 birds with abnormal plumages, 82 are expected to be leucistic, and only three are expected to be albinistic. ![]() This survey indicates that leucistic birds are much more common than albino birds, at a ratio of 82% to 3% of the 3,000 records submitted. Birds as small as wrens (0.3 to 0.4 ounces) and as large as common buzzards (1 to 3 pounds) were reported. In total, 3000 records of abnormal bird plumages were submitted, covering 58 species. “If you have seen a bird with unusual plumage in your garden, please complete our simple online questionnaire.” Results of the BTO survey A simple questionnaire posted online allowed the public to report birds with unusual plumages. The British Trust for Ornithology (BTO) surveyed the frequency of abnormal bird plumages. How common is leucism in birds compared to albinism? In other words, only about 1 bird in 30,000 has leucistic or albinistic plumage.īased on these results, leucism and albinism are very rare occurrences among birds. Only 236 of the 5.5 million birds reported each year had leucism or albinism, making up a tiny proportion of birds with abnormal plumages. Other abnormalities are not excluded but are expected to be even rarer. Birds with unusual plumage generally refer to individuals with leucism or albinism. ![]() Program participants reported 1,650 birds with unusual plumages visiting their feeders between 20, resulting in about 236 unusual-plumaged birds per year. How rare are leucistic and albinistic birds?Ĭornell Lab of Ornithology’s Feederwatch Program receives approximately 5.5 million reports of birds visiting the bird feeders of program participants each year.
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