The fauna of Illinois include a wide variety of mammals, birds, amphibians, reptiles, fish and insects (not listed).
The state bird is the northern cardinal. The state insect is the monarch butterfly. The state animal is the white-tailed deer. The state fish is the bluegill. The state fossil is the tully monster. The state amphibian is the eastern tiger salamander. The state reptile is the painted turtle. The state snake is the eastern milk snake.
List of native species
Mammals
Birds
Amphibians
Frogs and toads
Salamanders
Reptiles
Turtles
Lizards
Snakes
Fish
Sources http://www.inhs.illinois.edu/animals_plants/birds/ilbirds.html http://www.inhs.illinois.edu/cbd/collections/mammal/ilmammals.html http://www.inhs.illinois.edu/animals_plants/herps/ilspecies.html http://www.ifishillinois.org/species/species.html