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On a private nature reserve in Costa Rica, Donald Varela-Soto searched for the source of a shrill frog call for six months. What he found turned out to be a new species, a tiny green tree frog that ...
Savage, Jay M. and Heyer, W. Ronald. 1967. "Variation and distribution in the tree-frog genus Phyllomedusa in Costa Rica, central America." Beiträge zur Neotropischen Fauna, 5 111–131.
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