Class: Aves

This class includes all different kinds of birds. All birds have an outer covering of feathers, are endothermic, have front wings, and lay eggs.

Order: Sphenisciformes

This order includes all penguins, living and extinct.

Family: Spheniscidae

Spheniscidae is the only family classification in the order Sphenisciformes and includes all living and extinct penguins.

Click here to learn more about the different species of penguins.