Ohio's 15 species of frogs and toads at a glance
Frog - Wikipedia
37 Toadally Cool Facts About Frogs - Mr. Amphibian
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Amphibians of Alabama - Encyclopedia of Alabama
What Sounds do Frogs Make?
Clicks, bonks and dripping taps: listen to the calls of 6 frogs out and about this summer
Little Grass Frog
These new species of miniature frogs clearly have the best names
World's smallest frog — tinier than a penny — discovered