Another fish with a birdlike head (see image below) was reported by Gaston Carlet (1879), a member of the French Faculty of Medicine and a professor in the School of Medicine at Grenoble. This specimen, however, had a body like that of a trout instead of a carp. It was found in a lake in the upper Isère Valley (France) at an altitude of 2,000 meters. Carlet (p. 160) mentions that the fishermen who caught this specimen insisted that they had caught others like it in the past and that it must therefore "represent a new species." He also states (p. 157) that the lower jaw (mâchoire inférieure) was like that of any other trout, only it was slightly shorter than the usual given the size of the fish. Note that what appears to be the upper portion of a bird beak is visible in Carlet’s illustration.‡ Given the locale where the specimen was collected, Oncorhynchus mykiss, the rainbow trout, would likely have been the specific fish in question.
‡ It can be noted that in certain crosses, hybrids have been reported as having the upper mandible of one of their parents combined with a lower mandible like that of their other parent. Such, for example, is the case with certain alleged chicken-duck hybrids who, reportedly, have the upper bill of a chicken combined with the lower bill of the duck. A great shortening of the upper mandible in comparison with the lower is often seen in horse-cow hybrids. The same was reported for an alleged duck-cat hybrid that supposedly had a upper jaw like a cat and a lower one like a duck.
imageimageimageLeft: trout with a birdlike head (source: Carlet 1879); center: abnormal trout (source: Yarrell 1841, p. 108); right: ordinary trout for comparison.