For more than 300 years, the structure has puzzled researchers, reported that a mysterious bony growth found in elephants' feet is actually a sixth toe. According to Lead author Professor John Hutchinson, from the UK's structure and action laboratory at the Royal Veterinary College It's a cool mystery that goes back to 1706, when the first elephant was dissected by a Scottish doctor.
This fillet which is not quite an additional digit, but does the job of one helps the panda to hold bamboo, and is called the panda’s thumb or sixth finger. Moles too have a bone masquerading as an extra digit, which helps them to burrow. In the researchers, the arrangement was made of fillet, although fillet with an extremely unequal and unusual arrangement.