Nature News: Bullfrogs and their romantic summer sound

American Bullfrogs Fast Facts (U.S. National Park Service)

Watching frogs for lake health

Frogs and Salamanders - Seatuck Environmental Association

LIST: Frogs and Toads found in East Tennessee

The Natural History and Captive Care of the Smokey Jungle Frog

It is believed these semi-aquatic frogs are nocturnal and submerge

Bullfrog sex is fascinating (and just a little scary)

Country diary: A great migration at my feet, Amphibians

Nature News: The sweet summer sound of the treefrog chorus