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SCALES

2 kinds of scales cover reptiles—1 type for snakes and lizards, another for turtles and crocodilians. Fish are also covered in scales. In both groups, scales formed primarily for protection.
 

Fish

Kingdom: Animalia
Phylum: Chordata
(unranked): Craniata

Reptiles

Kingdom: Animalia
Phylum: Chordata
Clade: Sauropsida
Class: Reptilia