Polydactyly is an inherited characteristic and occurs in humans and animals are relatively common. Moles also have extra fingers. For them, the violation of the five-finger pattern of land vertebrates, however, is the norm. Now an international research team led by paleontologist explains the University of Zurich on the genetic background for the development of their extra "thumb". Among the carpal bones results in a bone that extends along the thumb and provides real hand a larger area for digging.
