More often heard than seen, the boreal chorus frog calls with a vibrating “prrreeep” that rises in pitch at the end. It lasts one or two seconds and sounds like someone running a fingernail over the teeth of a pocket comb. For a long time, our species was called the western chorus frog, but scientists now recognize it as a separate species.
Anaxyrus americanus americanus (formerly Bufo americanus)
The eastern American toad is medium-sized, with horizontal pupils and with a kidney-shaped gland behind each eye. Despite their rough complexion, most people find these common, harmless toads endearing.
The eastern spadefoot is a stout, toadlike amphibian with large, protruding eyes, vertically elliptical pupils, short legs, and large feet. In Missouri, it occurs in eastern counties along the Mississippi River and in the Bootheel.
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