Elephant skin
The skin of the elephant is not particularly thick, except over the back and sides where it can be 2-3 cm thick. An elephant's skin is very sensitive to the sun, and most babies are constantly shadowed by their mothers to avoid bad sun burns. To aid in helping to protect their skin, elephants will wallow in mud and cover themselves with dirt.
Kieron Nelson 2015 "Vanishing Cultures Photography" All rights reserved