Morley Read / Flat-headed spiny-backed frog (Osteocephalus planiceps) leaping from a branch, Amazon rainforest, Napo Province, Ecuador. (non-ex)

Ingo Arndt / Crowned Frog (Anotheca spinosa) in cloud forest, Costa Rica

Ingo Arndt / Crowned Frog (Anotheca spinosa) in cloud forest, Costa Rica

Michael & Patricia Fogden / Crowned Frog (Anotheca spinosa) male seeking shelter in bromeliad during rain storm, Costa Rica

Michael & Patricia Fogden / Crowned Frog (Anotheca spinosa) male, Costa Rica

Michael & Patricia Fogden / Crowned Frog (Anotheca spinosa) male, Costa Rica

Michael D. Kern / Spiny headed treefrog {Anotheca spinosa} captive, occurs Costa Rica, Honduras, Mexico, Panama

Philippe Clement / Spiny-headed / Crowned Tree frog {Anotheca spinosa} portrait on leaf, Costa Rica.

Michael & Patricia Fogden / Crowned Frog (Anotheca spinosa) on leaf in cloud forest, Costa Rica

Emanuele Biggi / Spiny-headed tree frog (Triprion spinosus) sitting on plant stem and looking around, Centro Manù, Costa Rica.

Emanuele Biggi / Spiny-headed tree frog (Triprion spinosus) sitting on plant stem and looking around, Centro Manù, Costa Rica.

Joel Sartore / Photo Ark / Slender-legged treefrog (Osteocephalus planiceps) male, portrait, from the wild, Centro de Rescate Amazonico, Peru.