A male American_bullfrog (Lithobates catesbeianus)., The species is the largest true frog native to North America. Behind the eyes are large external eardrum (the tympanum). Males and females differ by the size of their tympanum: the size of female's tympanum is about the size of an eye while male's tympanum is about two times larger than an eye.

Nikon Coolpix P950

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