The Largest Frog in North America
The bullfrog is the largest frog found in North America. Color varies from brownish to shades of green, often with spots or blotches of a darker color on the back. The hind feet are fully webbed. The sex of an adult bullfrog can be easily determined by examining the size of the tympanum (the external ear of the frog) relative to that of the eye. The tympanum is a round circle located on the side of the head behind the eye, and in males it is much larger than the eye. In females, the tympanum is as large or smaller than the eye. During the breeding season the throat of the male bullfrog is yellow, whereas the female's is white.
The above photo of a female bullfrog was taken at Alameda Park in Butler County. In 1995, Western Pennsylvania Conservancy acquired a 15-acre addition to the 400-acre park. The property consists of mature woodlands and has an unnamed stream flowing through it.
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