Interdigital webbing refers to the presence of skin membranes. Normally, in mammals, webbing is present but resorbed later in development, but in various mammal species, it occasionally persists in adulthood.[1] In humans, it can be found in those suffering from LEOPARD syndrome and from Aarskog–Scott syndrome.[2]
Webbing between the digits of the hindfoot is also present in several mammals that spend part of their time in the water.[3] Webbing accommodates movement in the water.[4]
Interdigital webbing is not to be confused with syndactyly, which is a fusing of digits and occurs rarely in humans. Syndactyly specifically affecting feet occurs in birds (such as ducks), amphibians (such as frogs), and mammals (such as the kangaroo).