Members o the rhinoceros faimily are characterized bi thair lairge size (thay are some o the lairgest remainin megafauna, wi aw o the species able tae reach ane tonne or mair in wicht); as well as bi an herbivorous diet; a thick pertective skin, 1.5–5 cm thick, furmed frae layers o collagen poseetioned in a lattice structur; relatively smaa brains for mammals this size (400–600 g); an a lairge horn. Thay generally eat leafy material, altho thair ability tae ferment fuid in thair hindgut allaes them tae subsist on mair fibrous plant matter, if necessary. Unlik ither perissodactyls, the twa African species o rhinoceros lack teeth at the front o thair muiths, relyin instead on thair pouerfu premolar an molar teeth tae grind up plant fuid.