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A side view of a frog's internal structure.

Frog

A side view of a frog's internal structure.

A ventral view of a frog's internal structure.

Frog

A ventral view of a frog's internal structure.

A ventral view of a frog's internal nervous system.

Frog

A ventral view of a frog's internal nervous system.

The mud puppy has two pairs of legs. It also has persistent external gills. It can attain a length of two feet.

Mud Puppy

The mud puppy has two pairs of legs. It also has persistent external gills. It can attain a length of…

The name given to various animals included in the class Amphibia and in the order Urodela of that class. The salamanders may be divided into the land salamander and the water salamanders.

Cold Blooded Salamander

The name given to various animals included in the class Amphibia and in the order Urodela of that class.…

The development of a toad, image 1.

Toad

The development of a toad, image 1.

The development of a toad, image 3.

Toad

The development of a toad, image 3.

The development of a toad, image 4.

Toad

The development of a toad, image 4.

The development of a toad, image 5.

Toad

The development of a toad, image 5.