Mark Hamblin / 2020VISION / Cul Mor in winter, Coigach, Wester Ross, Scotland, UK, December 2010

Thomas Marent / Buckley's Slender-legged Treefrog (Osteocephalus buckleyi), Putumayo, Colombia

Heidi & Hans-Juergen Koch / Cayenne Slender-legged Tree Frog (Osteocephalus leprieurii) completely developed young frog sitting in shallow water, native to South America

Phil Savoie / Tree frog (Ostocephalus oophagus) in bromeliad, female lays eggs for her tadpoles to eat. Brazil, South Americal

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

Heidi & Hans-Juergen Koch / Cayenne Slender-legged Treefrog (Osteocephalus leprieurii) tadpoles, native to South America

MYN / JP Lawrence / Frog (Osteocephalus buckleyi) San Jose de Payamino, Ecuador. Meetyourneighbours.net project

MYN / JP Lawrence / Frog (Osteocephalus buckleyi) San Jose de Payamino, Ecuador. Meetyourneighbours.net project

Pete Oxford / Flat-headed Bromeliad Treefrog (Osteocephalus planiceps), native to South America

Konrad Wothe / Frog (Osteocephalus sp.) Panguana Reserve, Huanuco province, Amazon basin, Peru.

Cyril Ruoso / Manaus Slender-legged Treefrog (Osteocephalus taurinus) in rainforest, Pacaya Samiria National Park, Peru

Cyril Ruoso / Manaus Slender-legged Treefrog (Osteocephalus taurinus) in rainforest, Pacaya Samiria National Park, Peru

Pete Oxford / Tree frog (Osteocephalus taurinus) Yasuni National Park, Amazon Rainforest, Ecuador. South America.

Pete Oxford / Tree frog (Osteocephalus taurinus) Yasuni National Park, Amazon Rainforest, Ecuador. South America.

MYN / Andrew Snyder / Manaus slender legged frog (Osteocephalus taurinus), Berbice River, Guyana, September. Meetyourneighbours.net project.

Sean Crane / Manaus Slender-legged Treefrog (Osteocephalus taurinus) sitting on a leaf, Madidi National Park, Bolivia

MYN / Andrew Snyder / Manaus slender-legged tree frog (Osteocephalus taurinus) Chenapau, Guyana. Meetyourneighbours.net project.

MYN / Andrew Snyder / Manaus slender-legged tree frog (Osteocephalus taurinus) Chenapau, Guyana. Meetyourneighbours.net project.

MYN / Andrew Snyder / Manaus slender-legged tree frog (Osteocephalus taurinus) Chenapau, Guyana. Meetyourneighbours.net project.

MYN / Andrew Snyder / Cayenne slender-legged treefrog (Osteocephalus leprieurii) Kanuku Mountains, Guyana. Meetyourneighbours.net project

MYN / Andrew Snyder / Cayenne slender-legged treefrog (Osteocephalus leprieurii) Kanuku Mountains, Guyana. Meetyourneighbours.net project

MYN / Andrew Snyder / Cayenne slender-legged tree frog (Osteocephalus leprieurii) Kanuku Mountains, Guyana. Meetyourneighbours.net project

MYN / Andrew Snyder / Manaus slender-legged tree frog (Osteocephalus taurinus) Iwokrama, Guyana. Meetyourneighbours.net project

MYN / Andrew Snyder / Manaus slender-legged tree frog (Osteocephalus taurinus) Iwokrama, Guyana. Meetyourneighbours.net project

Piotr Naskrecki / Manaus Slender-legged Treefrog (Osteocephalus taurinus) in rainforest, Suriname

Pete Oxford / Ecuador Slender-legged Treefrog (Osteocephalus verruciger), Yasuni National Park, Amazon Rainforest, Ecuador

Pete Oxford / Yasuni Treefrog (Osteocephalus yasuni), Yasuni National Park, Amazon, Ecuador

Pete Oxford / Tree Frog (Osteocephalus sp), Yasuni National Park, Amazon, Ecuador

Bert Willaert / Manaus Slender-legged Treefrog (Osteocephalus taurinus) portrait. Ecuador, January.

Pete Oxford / Giant broad-headed tree frog (Osteocephalus taurinus) in rainforest, Iwokrama Reserve, Guyana

Pete Oxford / Giant broad-headed tree frog (Osteocephalus taurinus) in rainforest, Iwokrama Reserve, Guyana

Juan Manuel Borrero / Tree frog (Osteocephalus taurinus) profile portrait sitting on leaf, Pacaya Samiria National Reserve. Amazon Basin. Loreto. Peru

Pete Oxford / Manaus Slender-legged Treefrog (Osteocephalus taurinus), Iwokrama Rainforest Reserve, Guyana

Murray Cooper / Buckley's Slender-legged Treefrog (Osteocephalus buckleyi), Amazon, Ecuador

Thomas Marent / Buckley's Slender-legged Treefrog (Osteocephalus buckleyi) portrait, Tambopata National Reserve, Peru

Piotr Naskrecki / Forest Bromeliad Treefrog (Osteocephalus cabrerai) portrait on leaf, Guyana

Pete Oxford / Tree frog {Osteocephalus taurinus} Yasuni NP, Ecuador

Pete Oxford / Tree frog {Osteocephalus sp} Amazonia, Ecuador

MORLEY READ / Buckleys bonehead tree frog {Osteocephalus buckleyi} Yasuni NP, Ecuador

MORLEY READ / Yasuni bonehead tree frog {Osteocephalus yasuni} Yasuni NP, Ecuador

MORLEY READ / Quacking bonehead tree frog {Osteocephalus sp} Yasuni NP, Ecuador

Pete Oxford / Tree frog climbing tree {Osteocephalus sp} Amazonia, Ecuador

Pete Oxford / Tree frog {Osteocephalus taurinus} Iwokrama reserve, Guyana

Pete Oxford / Tree frogs in amplexus {Osteocephalus taurinus} Iwokrama reserve, Guyana

Pete Oxford / Large treefrog {Osteocephalus taurinus}, hanging from branch, Yasuni NP, Ecuador

Phil Savoie / Treefrog female laying eggs in Bromeliad plant pool for her tadpoles to eat, Brazil

Heidi & Hans-Juergen Koch / Cayenne Slender-legged Tree Frog (Osteocephalus leprieurii) silhouette of tadpole with developed tail and legs, native to South America

Heidi & Hans-Juergen Koch / Cayenne Slender-legged Tree Frog (Osteocephalus leprieurii) tadpole with developed tail and legs, native to South America

Heidi & Hans-Juergen Koch / Cayenne Slender-legged Tree Frog (Osteocephalus leprieurii) close-up of three tadpoles, native to South America

Heidi & Hans-Juergen Koch / Cayenne Slender-legged Tree Frog (Osteocephalus leprieurii) close-up portrait of tadpole, native to South America

Heidi & Hans-Juergen Koch / Cayenne Slender-legged Tree Frog (Osteocephalus leprieurii) tadpoles, native to South America

Thomas Marent / Buckley's Slender-legged Treefrog (Osteocephalus buckleyi), Putumayo, Colombia

Thomas Marent / Buckley's Slender-legged Treefrog (Osteocephalus buckleyi), Putumayo, Colombia

Thomas Marent / Buckley's Slender-legged Treefrog (Osteocephalus buckleyi), Putumayo, Colombia

Piotr Naskrecki / Manaus Slender-legged Treefrog (Osteocephalus taurinus) in rainforest looking over its shoulder, Suriname

Pete Oxford / Ecuador Slender-legged Treefrog (Osteocephalus verruciger), Yasuni National Park, Amazon Rainforest, Ecuador

Pete Oxford / Tree Frog (Osteocephalus sp), Yasuni National Park, Amazon, Ecuador

Pete Oxford / Tree Frog (Osteocephalus sp), Yasuni National Park, Amazon, Ecuador

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

Joel Sartore / Photo Ark / Funny slender-legged treefrog (Osteocephalus deridens) head portrait, from the wild, Centro de Rescate Amazonico, Peru.

Joel Sartore / Photo Ark / Funny slender-legged treefrog (Osteocephalus deridens) portrait, from the wild, Centro de Rescate Amazonico, Peru.

Joel Sartore / Photo Ark / Funny slender-legged treefrog (Osteocephalus deridens) portrait, from the wild, Centro de Rescate Amazonico, Peru.