It is fur or hair.
The body covery of the fish is there skins.
A mammals covered with hairand skin.
Most mammals have fur or hair .
Mammals need to keep their body warm and it is possible by the body covering they have...fur and hair
The body covering of birds is feathers. Mammals are covered in fur or hair.
Skin, hair and fur are all the examples of body covering of mammals.
Reindeer are mammals. Mammals are homeostatic animals which maintain a warm body temperature.
Mammals have a body covering of hair or fur.
We are mammals and mammals are land creatures. We have hair to keep ourselves warm.
One possibility is - Discovery... feel free to edit this answer and add some more !
Though platypuses lay eggs, they are mammals as they have body hair.
Food.