Frogs and Toads of Colorado
The Wood Frog is easy to identify because of the dark mask on its face.
The American Bullfrog is the largest native frog in the United States. There is no dorsal ridge that runs down its back on the American Bullfrog. This is the distinguishable characteristics of the frog.
The Northern Leopard Frog and Plains Leopard Frog appear identical. They both have large spots all over their body. The difference between the frogs lies in their dorsal ridge. The Northern Leopard Frog’s ridge runs straight down the side while the Plains Leopard Frog’s ridge indents near the butt.
No stripe through eye. Skin is rather rough. Has distinct toe-pads used for climbing
Three lines down back. No toe pads.
The Northern Cricket Frog is the only frog in the state. No distinct marks. No toe pads
V shaped Cranial Crest
Opposing L shaped cranial crests
No cranial crest, Has stripe down middle of back.
No cranial crest. No stripe down middle of the back. elongated parotoid gland.
No cranial crest. No stripe down middle of the back. Parotoid gland is also rather small.
Round-shape Spade, glandular boss
Round-shape Spade, no boss
Round-shape Spade, bony boss
The Western Narrowed Mouth Toad is the only narrowed mouth toad in the state. It’s not a true toad because it lacks a parotoid gland behind its eye and doesn’t have a keratonized spade on its rear feet.