Birds vary in the number of feathers they have, according to species, size, age, sex, metabolism, health and season. Notwithstanding these factors, however, adult birds of given species taken at a given time of the year can still have a different number of feathers. In general, the whistling swan has the highest number of feathers, with a total of 25,216 counted on one bird. Nearly 80% of these were on the head and long neck.

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