Abstract
BIRDS with extra toes, extra legs and wings have frequently been described. Bond (1926) and Punnett and Pease (1929) asserted that there was a true genetic factor controlling the appearance of the supernumerary toes in extra-digited chicks. An extra leg was described by Adams (1930), Stoneman (1932) and Shaw (1934) for a chicken, an English Sparrow and a duck respectively. Oka (1926) described a chick and K'rienecky (1926) a goose, each with four legs, and the latter author also gave an account of a chick with four legs and four wings. Chidester (1927) reviews the cases of four chicks and one duck, all with four legs each, and one chick having four legs and four wings. Although certain pigeons (fantails) have regularly many extra tail feathers, sometimes as high as from thirty to forty, no one, so far as the author is aware, with the exception of Kuhn (1932), has ever described a bird with two separate tails. Kuhn's case was that of a canary which had an extra tail growing from near the middle of its back. It seems worth while, therefore, to publish this note concerning a Robin with two distinct sets of tail feathers, which the author came across while examining some birds for protozoan parasites.
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