Osteocephalus buckleyi — Buckley’s Slender-legged Treefrog
I had originally identified these frogs as the similar-looking Osteocephalus cabrerai, but my current understanding of the differences between the two species is that O. cabrerai has more fringing and more tubercles than these frogs do.
The busy dorsal pattern isn't very good camouflage against a plain green leaf, but you can easily imagine how well this frog would blend in against a mossy branch.
- Osteocephalus buckleyi account on AmphibiaWeb
- Osteocephalus buckleyi account on Amphibian Species of the World
- Dixon, J. R. and Soini, P. 1986. The Reptiles of the Upper Amazon Basin, Iquitos Region, Peru