skin
Apart from skin, they are covered with dense fur (hair).
The skin of a walrus.
Toucans are mostly covered with feathers, but underneath that is skin.
the body structure of a walrus is I don't exactly knoow
Animals can be covered with fur or feathers or scales or naked skin. It depends on what animal you're talking about.
They mostly swim I guess.
The walrus has a thick layer of blubber beneath the skin to keep it warm.
because it is a mammal
tiny hairs
A polar bearThe predators of walrus mostly revolve around polar bears and orcas aka killer whales.
A swan is mostly covered with feathers.