Pete Oxford / Tree frog (Hyla / Hypsiboas calcarata) balancing on twig, Iwokrama Reserve, Guyana

Piotr Naskrecki / Blue-flanked Tree Frog (Hyla calcarata) camouflaged amid leaf litter on forest floor, Guyana

Piotr Naskrecki / Blue-flanked Tree Frog (Hyla calcarata) camouflaged amid leaf litter on forest floor, Guyana

Doug Wechsler / Tree frog {Hyla calcarata} Amazonia, Ecuador

Pete Oxford / Tree frog {Hyla calcarata} Manu NP, Peru

MORLEY READ / Treefrog {Hyla calcarata} Yasuni NP, Ecuador

Pete Oxford / Tree frog on leaf (Hyla calcarata) Amazon, Manu NP, Peru

Pete Oxford / Blue-flanked Tree Frog (Hyla calcarata) on tree trunk, Amazon rainforest, Ecuador