AH_Emerald Glass Frog male Espadarana prosoblepon humeral hook_4578.jpg
Emerald Glass Frog male {Espadarana prosoblepon}. As can clearly be seen here males have a humeral hook, a bony spine projecting from the humerus that may be used in male to male combat. Osa Peninsula, Costa Rica. May.
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- © Alex Hyde
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