Skin
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Alligators are reptiles. All reptiles have a body covering of scaly skin. They do not have individual scales like fish do.
The body covering of a python is known as scales. The python is a snake which has a flexible body which is covered with overlapping scales.
The same word - starfish
You call it Erizo de mar.
This is the exoskeleton, or chitin, chitinous covering.
Rabbits are mammals. Mammals have a covering of skin and hair. In the case of rabbits we would call this covering skin and soft fur.
a starfish
Invertebrate.
Walruses don't have what you'd call fur. Similar to humans, they have scattered hairs covering their body.
www.jellyfishworld.com is a Vancouver based company. They have rare purple starfish and some very large sun starfish. Call them to see if they have the colour you are looking for. www.Petco.com then type starfish
The feathers covering the body of a bird are typically called its plumage.