Amphibian Illustrations
Bullfrog (Rana catesbeiana), watercolor
About the illustration:
Commissioned by: Wisconsin Sea Grant, University of Wisconsin-Madison
About the bullfrog:
Bullfrogs are as surprisingly large as cricket frogs are small. They breed from June through July. Females lay 10,000 to 20,000 eggs in large, gelatinous masses. The tadpoles are also large. They spend 3 to 14 months in the water before metamorphosis. Bullfrogs eat anything smaller than they are (birds, rodents, fish, frogs, toads...) They are nocturnal.
Taxonomy:
Kingdom: Animalia
Phylum: Chordata (having a spinal chord)
Class: Amphibia
Order: Anura (frogs and toads)
Family: Ranidae (true frogs)
Genus: Rana
Species: R. catesbeiana
For more information about bullfrogs:
eNature, National Wildlife Federation
Reptiles and Amphibians of Minnesota