The elephant is the largest land mammal and has the longest nose on earth. Elephants are social animals and stay in herds of 420 animals. Herds are usually made up of only female elephants, including calves of both sexes, with the oldest and wisest female as their leader (called matriarch). Males may follow the herds for a while, but are not really included due to Musth (a seasonal peak in hormones and aggression). In Asia, unlike in Africa, only the male grows big tusks, which continue to grow throughout the elephant’s life. The elephant’s skin varies in thickness from paper thin, inside the ears, around mouth and anus, to 2.5cm thick around the back and in some places on the head. Asian elephants are ‘endangered’ on the IUCN List and are on Appendix I of CITES.