Bullfrog (Rana catesbeiana)

Bullfrog on Lily Pad 

The Bullfrog (Rana catesbeiana) or American Bullfrog is an amphibian of order Anura, True Frog Family (Ranidae), genus Rana and species catesbeiana. It grows to a length of  three and a half to eight inches (nine to 20 centimeters). The body is olive-green or green to yellow above with patches of gray that may give this frog a gray appearance particularly under water. Its belly is cream to white colored, but like the remainder of the body, may be mottled with gray. It has a large external eardrum as seen in the photograph below. The female Bullfrog has eardrums the size of her eyes. Male Bullfrogs have eardrums larger than their eyes. The hind feet are webbed except for the last joint of the longest toe as seen on the left foot in the photograph above and in the bottom most photograph below. It has no dorsal (back) ridges.

Bullfrog (Rana catesbeiana)

The family and genus names come from the Latin for "frog."

These frogs mate in late spring and early summer and produce as many as 20,000 eggs in one laying. The eggs are attached in masses to submerged vegetation. Tadpoles can require two years to mature during which they are subject to predation.

Bullfrog (Rana catesbeiana)

Their diet consists of  invertebrates, fish, birds, small animals, including other frogs and tadpoles. This frog is common on Mount Desert Island.

The Bullfrog (Rana catesbeiana) lives on the shores of lakes and ponds. When frightened, it will jump into the water and hide among vegetation.

These frogs are frequently used as specimens in biology classes and their legs are considered a food delicacy.


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