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"Fig. 44- Syndactyle foot of a kingfisher. Thus a kingfisher shows what is called a syndactyle or syngnesious foot (fig. 44), where the outer and middle toes cohere for most of their extent and have a broad sole in common. It is a degradation of the insessorial foot, and not a common one either; seen in those perching birds which scarcely use their feet for progression, but simply for sitting motionless." Elliot Coues, 1884

The foot of a Kingfisher

"Fig. 44- Syndactyle foot of a kingfisher. Thus a kingfisher shows what is called a syndactyle or syngnesious…