Pete Oxford / Tree frog {Hyla pellucens} Mindo Cloud Forest, Ecuador

Gabriel Rojo / Tree frog {Hyla pulchella cordobae} Condorito NP, Cordoba, Argentina

Gabriel Rojo / Tree frog {Hyla pulchella cordobae} Condorito NP, Cordoba, Argentina

Pete Oxford / Chachi tree frog {Hyla picturata} Cotacachi Cayapas reserve, Ecuador

Pete Oxford / Chachi Tree Frog (Hyla picturata) adult, Choco Rainforest, threatened habitat, Ecuador

Pete Oxford / Chachi Tree Frog (Hyla picturata) adult, Choco Rainforest, threatened habitat, Ecuador

Pete Oxford / Chachi Tree Frog (Hyla picturata) adult, Choco Rainforest, threatened habitat, Ecuador

Pete Oxford / Chachi Tree Frog (Hyla picturata), Choco Rainforest, threatened habitat, northwestern Ecuador

Pete Oxford / Chachi Tree Frog (Hyla picturata) silhouette, threatened habitat, Choco Rainforest, Ecuador

Michael & Patricia Fogden / Canal Zone Treefrog (Hypsiboas rufitelus) rainforest, Costa Rica

Michael & Patricia Fogden / Chachi Tree Frog (Hyla picturata) rainforest, Ecuador

Pete Oxford / Chachi Tree Frog (Hyla picturata) portrait, Cotacachi-Cayapas Reserve, Ecuador

Michael & Patricia Fogden / Map Treefrog (Hyla geographica) on Heliconia, in rainforest, Costa Rica

Pete Oxford / Rosenberg's Gladiator Tree Frog (Hypsiboas rosenbergi) clinging to leaf in rainforest, Ecuador

Pete Oxford / Rosenberg's Gladiator Tree Frog (Hypsiboas rosenbergi) on leaf showing webbed feet, Choco Ecoregion, San Lorenzo northwestern Ecuador

Michael & Patricia Fogden / Canal Zone Treefrog (Hypsiboas rufitelus) in rainforest, La Selva Biological Research Station, Costa Rica

Pete Oxford / Chachi Tree Frog (Hyla picturata) pair, Cotacachi-Cayapas Reserve, northwest Ecuador

Norbert Wu / Giant Gladiator Treefrog (Hypsiboas boans) sleeps in fold of leaves by day, rainforest, Queensland, Australia

Pete Oxford / Chachi treefrog {Hyla picturata} Cotacachi-Cayapas Reserve, Ecuador

Pete Oxford / Chachi tree frog {Hyla picturata} Cotacachi-Cayapas Reserve, Ecuador

Pete Oxford / Tree frog (Hyla punctata) Western Ecuador, S. America C

Gabriel Rojo / Treefrog {Hyla pulchella} La Pampa, Argentina

Piotr Naskrecki / Rosenberg's Gladiator Tree Frog (Hypsiboas rosenbergi), Costa Rica

Paul Bertner / Map Treefrog (Hyla geographica) juvenile, Sani Lodge, Ecuador

Sean Crane / Canal Zone Treefrog (Hypsiboas rufitelus) and Golden Palm Tree Frog (Dendropsophus ebraccatus), El Valle, Panama

Agustin Esmoris / Blacksmith Tree Frog (Hypsiboas faber) trio at night, Argentina

Agustin Esmoris / Blacksmith Tree Frog (Hypsiboas faber) calling, Argentina

Sebastian Kennerknecht / Gladiator Frog (Hypsiboas riojanus), Jujuy, Argentina

Piotr Naskrecki / Tree Frog (Hypsiboas calcaratus), Suriname

Piotr Naskrecki / Emerald-eyed Treefrog (Hypsiboas crepitans), Brownsberg Reserve, Surinam

Pete Oxford / Chachi Tree Frog (Hypsiboas picturatus) showing skin pattern on back, northwest Ecuador

Thomas Marent / Emerald-eyed Treefrog (Hypsiboas crepitans) camouflaged against tree bark, Colombia

PREMAPHOTOS / Andean tree frog (Hyla pulchella) with throat sac inflated, at an altitude of 3400m in the Bolivian Andes

PREMAPHOTOS / Andean tree frog (Hyla pulchella) with throat sac inflated, at an altitude of 3400m in the Bolivian Andes

Pete Oxford / Chachi Tree Frog (Hyla picturata), Cotacachi-Cayapas Reserve, northwest Ecuador

Doug Wechsler / Red-webbed treefrog (Hypsiboas rufitelus) resting on leaf, La Selva Biological Station, Costa Rica.

Doug Wechsler / Red-webbed treefrog (Hypsiboas rufitelus) on leaf, La Selva Biological Station, Costa Rica.

Maxime Aliaga / Imbabura tree frog (Hypsiboas picturatus), Mache Chindul Reserve, Choco, Ecuador

Maxime Aliaga / Rosenberg's tree frog (Hypsiboas rosenbergi) Mache chindul reserve, Choco, Ecuador

Morley Read / Portrait of male Tetete treefrog (Boana tetete) calling in the rainforest understory, Napo province, Ecuador. A rare species known only from few sites in the Amazon basin of Ecuador and Peru, IUCN vul...

Morley Read / Blue-flanked treefrogs (Boana calcarata) perching in vegetation above a rainforest creek. Yasuni National Park, Ecuador.

Doug Wechsler / Palmar treefrog (Hypsiboas pellucens) Buenaventura Reserve, Ecuador.

Nick Hawkins / Imbabura tree frog (Hypsiboas picturatus) in cloud forest, Choco region, Northwestern Ecuador.

Nick Hawkins / Imbabura tree frog (Hypsiboas picturatus) in cloud forest, Choco region, Northwestern Ecuador.

Nick Hawkins / Imbabura tree frog (Hypsiboas picturatus) in cloud forest, Choco region, Northwestern Ecuador.

Nick Hawkins / Imbabura tree frog (Hypsiboas picturatus) in cloud forest, Choco region, Northwestern Ecuador.

Nick Hawkins / Imbabura tree frog (Hypsiboas picturatus) in cloud forest, Choco region, Northwestern Ecuador.