Skin and hair, just like on a human. But, in the gorilla's case, a lot more hairy!
Hairy skin .
what is seahorse outer-covering
The outer covering of the eyeball is cornea.
Amphibians do not have outer covering.
The skin covering of a gorilla is dense fur. Though, they don't appreciate periods of cold rain and will seek some sort of shelter - which we humans will also do!
Bat is a mammal, so it's outer covering is hair whereas bird's outer covering is feather.
A seals outer covering is thick skin.
an ant's outer covering is their exoskeleton
Camels have hair as their outer covering.
Tonoplast is the outer covering of vacuole
The outer covering of a prawn in a shell.
The outer covering of the grain is called Husk.