3. Thick skin
Always dressed for battle, rhinos keep their armour with them
Rhinos are covered in thick grey skin made of collagen arranged in a lattice structure. One layer would be weak, but many together form a protective barrier up to five centimetres (two inches) thick. This thick skin is like armour for a rhino, protecting it from thorny vegetation and attacks from rivals. The outer layer is still sensitive though, so it must be kept in the best condition possible.
Rhinos wallow in mud to moisturise their skin and shield it from damaging sunrays and insects. Usually not fond of company, they allow birds like oxpeckers to perch on their backs and pick out any unwelcome parasites.
As with many animals, a rhino will fiercely defend its young against any threat