Mammals

What is a Mammal? (Georgia Museum of Natural History and Georgia Department of Natural Resources)
Mammalia (University of Michigan Museum of Zoology Animal Diversity Web)

Birds

What is a Bird? (Georgia Museum of Natural History and Georgia Department of Natural Resources)
Aves (Birds) (University of Michigan Museum of Zoology Animal Diversity Web)

Fish

Fishes (University of Michigan Museum of Zoology Animal Diversity Web)

Reptiles

What is a Reptile? (Georgia Museum of Natural History and Georgia Department of Natural Resources)
Reptilia (University of Michigan Museum of Zoology Animal Diversity Web)

Amphibians

What is an Amphibian? (Georgia Museum of Natural History and Georgia Department of Natural Resources)

Checklist of Amphibian Species and Identification Guide (U.S. Geological Survey)
Lissamphibia (University of Michigan Museum of Zoology Animal Diversity Web)

Invertebrates

Anthropoda (University of Michigan Museum of Zoology Animal Diversity Web)

Echinodermata (University of Michigan Museum of Zoology Animal Diversity Web)

Mollusca (University of Michigan Museum of Zoology Animal Diversity Web)

Other Definitions