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On the back this notecard says in part:
Horned and Widemourthed Frogs. From the genus Ceratophrys.
Horned frogs range in size from one to eight inches
and inhabit the tropical regions of South and Central America.
They have "horns" or flaps of skin above their eyelids which
may function to camouflage and
disguise their outline
as they wait amid the leaf debris to lunge out at unwary prey.