Here is an interesting fact about the elephants' feet
Each elephant foot has 5 toes, but not every toe has a nail. An easy way to tell the two African elephant species apart is by counting toenails. The African forest elephant and the Asian elephant both have 5 toenails on the front feet and 4 on the back feet. The larger African bush elephant has 4 or sometimes 5 on the front feet and 3 on the back. An X-ray of an elephant’s foot will reveal that its bones are actually standing on tip-toe. Their feet are flat because of a large pad of gristle under each heel which acts as a shock absorber and helps them walk quietly. Their legs are much straighter than those of other animals and support their weight so well that elephants sleep while standing. Elephants spend most of their lives walking huge distances, and their feet are suitably adapted to such a lifestyle. Zoos which keep elephants often find they develop foot problems due to a lack of constant walking, and treatments include tailored shoes to protect their softened feet.
Source: ListVerse, by Kate Mulcahy