A green treefrog (above) in temporary brown coloration, and a squirrel treefrog. Where treefrogs are abundant, sometimes several assemble in a location protected from the sun during the heat of the day. (Photo by T. Lodge.)
The squirrel treefrog may be the most commonly encountered amphibian for visitors to the Everglades, known for its coloring and occasional loud, scratchy outbursts. Like the somewhat larger green treefrog, it can change color from green to brown. Once common in Miami, both species have almost completely disappeared, most likely due to predation by the introduced Cuban treefrog
A similar situation has resulted in the elimination of the southern toad from urban areas. The much larger cane toad was introduced in the area and preyed on the southern toad. Large poison glands on the sides of the neck area exude a white, milky toxin when the toad is disturbed, making them poisonous to dogs.