Pascal Pittorino / Mediterranean tree frog (Hyla meridionalis) resting on a Red rose (Rosa sp) in organic garden, Toulon, Var, Provence, France, May.

Thomas Marent / European Tree Frog (Hyla arborea) calling, Switzerland

Pete Oxford / Chachi Tree Frog (Hypsiboas picturatus), northwest Ecuador

Thomas Marent / Tree Frog (Hyla rubracyla) at night, Colombia

Fabio Liverani / Tree frog {Hyla sp} feeding on grasshopper, Tambopata National Reserve, Amazonia, Peru

Fabio Liverani / Tree frog {Hyla sp} on rim of tropical fungus, Tambopata National Reserve, Amazonia, Peru

Fabio Liverani / Tree frog {Hyla sp} face portrait, Tambopata National Reserve, Amazonia, Peru

Michael Durham / A three year old boy with a Pacific Tree Frog (Pseudacris regilla)

Michael Durham / Pacific Chorus Frog (Pseudacris regilla) jumping into pond, Oregon

Michael & Patricia Fogden / Costa Rica Brook Frog (Duellmanohyla uranochroa) population numbers have been affected by climate change, Costa Rica

Pete Oxford / Strawberry Tree Frog (Hyla pantosticta) male on a bromeliad in the cloud forest, Carchi Province, northeastern Ecuador

Pete Oxford / Cloud Forest Tree Frog (Hyla pellucens) sitting on edge of leaf, Choco Rainforest, northwest Ecuador

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

Claus Meyer / Tree Frog (Hyla sp) balanced on fern fiddlehead, Atlantic Forest, Brazil

Jan Vermeer / European Tree Frog (Hyla arborea) hanging on plant, Europe

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

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

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

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

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

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

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

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

Sean Crane / Canal Zone Treefrog (Hypsiboas rufitelus), El Valle, Panama

Thomas Marent / Palmer's Treefrog (Hyloscirtus palmeri) froglet with tadpole tail, San Cipriano, Colombia

Steve Gettle / Gray Tree Frog (Hyla versicolor) on flower, Howell Nature Center, Michigan

Steve Gettle / Gray Tree Frog (Hyla versicolor), northern Michigan

Pete Oxford / Chachi Tree Frog (Hypsiboas picturatus), Mashpi Rainforest Biodiversity Reserve, Pichincha, Ecuador

James Christensen / Pacific Chorus Frog (Pseudacris regilla) female hiding in creek bed, Eagle Cap Wilderness, Oregon

Pete Oxford / Chachi Tree Frog (Hypsiboas picturatus), native to South America

Pete Oxford / Chachi Tree Frog (Hypsiboas picturatus), native to South America

Pete Oxford / Chachi Tree Frog (Hypsiboas picturatus), native to South America

Pete Oxford / Chachi Tree Frog (Hypsiboas picturatus), native to South America

Pete Oxford / Chachi Tree Frog (Hypsiboas picturatus), native to South America

Sean Crane / Golden Palm Tree Frog (Dendropsophus ebraccatus) tadpole on a leaf, Pavones, Costa Rica

Pete Oxford / Executioner Treefrog (Hyla carnifex), Mindo Cloud Forest, Andes, Ecuador

Pete Oxford / Executioner Treefrog (Hyla carnifex), Mindo Cloud Forest, Andes, Ecuador

Pete Oxford / Green Tree Frog (Hyla cinerea), Little Saint Simon's Island, Georgia

Pete Oxford / Green Tree Frog (Hyla cinerea), Little Saint Simon's Island, Georgia

Pete Oxford / Green Tree Frog (Hyla cinerea), Little Saint Simon's Island, Georgia

Sean Crane / Golden Palm Tree Frog (Dendropsophus ebraccatus) with a mosquito on its eye, Corcovado National Park, Costa Rica

Steve Gettle / Eastern Gray Treefrog (Hyla versicolor) calling, Huron Meadows Metropark, Michigan

Steve Gettle / Eastern Gray Treefrog (Hyla versicolor) calling, Huron Meadows Metropark, Michigan

Donald M. Jones / Pacific Tree Frog (Hyla regilla), northwestern Montana

Donald M. Jones / Pacific Tree Frog (Hyla regilla) hiding in Ponderosa Pine (Pinus ponderosa) tree bark, western Montana

Cyril Ruoso / European Tree Frog (Hyla arborea) calling, Alsace, France

Cyril Ruoso / European Tree Frog (Hyla arborea) on branch, Alsace, France

Cyril Ruoso / European Tree Frog (Hyla arborea) on leaf, Alsace, France

Cyril Ruoso / European Tree Frog (Hyla arborea) on leaf, Alsace, France

Cyril Ruoso / Pacific Chorus Frog (Pseudacris regilla) male calling, Conboy Lake National Wildlife Refuge, Washington

Suzi Eszterhas / Tarraco Treefrog (Smilisca phaeota), Osa Peninsula, Costa Rica

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

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

Ingo Arndt / Lancaster's Treefrog (Isthmohyla lancasteri) on leaf, Costa Rica

Christian Ziegler / Hourglass Treefrog (Hyla ebraccata) egg mass, Soberania National Park, Panama

Pete Oxford / Marbled Tree Frog (Hyla marmorata) camouflaged on tree, Yasuni National Park, Amazon Rainforest, Ecuador

Thomas Marent / Rosenberg's Gladiator Tree Frog (Hypsiboas rosenbergi), Piedras Blancas National Park, Costa Rica

Thomas Marent / Tarraco Treefrog (Smilisca phaeota) trio in amplexus, Piedras Blancas National Park, Costa Rica

Thomas Marent / Tarraco Treefrog (Smilisca phaeota) on mushroom, Piedras Blancas National Park, Costa Rica

Pete Oxford / Map Treefrog (Hyla geographica) froglet on leaf, Yasuni National Park, Amazon, Ecuador

Thomas Marent / European Tree Frog (Hyla arborea) calling, Switzerland

Thomas Marent / European Tree Frog (Hyla arborea) calling, Switzerland

Thomas Marent / European Tree Frog (Hyla arborea) pair in amplexus, Switzerland

Thomas Marent / European Tree Frog (Hyla arborea) calling, Switzerland

Thomas Marent / European Tree Frog (Hyla arborea) calling, Switzerland

Thomas Marent / European Tree Frog (Hyla arborea) calling, Switzerland

Thomas Marent / European Tree Frog (Hyla arborea) juvenile, Switzerland

Thomas Marent / European Tree Frog (Hyla arborea) tadpole showing legs and tail, Switzerland

Thomas Marent / European Tree Frog (Hyla arborea) tadpole showing legs and tail, Switzerland

Thomas Marent / European Tree Frog (Hyla arborea) tadpole showing legs and tail, Switzerland

Pete Oxford / Rosenberg's Gladiator Tree Frog (Hypsiboas rosenbergi), northwest Ecuador

Pete Oxford / Rosenberg's Gladiator Tree Frog (Hypsiboas rosenbergi), northwest Ecuador

Pete Oxford / Rosenberg's Gladiator Tree Frog (Hypsiboas rosenbergi), northwest Ecuador

Pete Oxford / Rosenberg's Gladiator Tree Frog (Hypsiboas rosenbergi), northwest Ecuador

Pete Oxford / Tarraco Treefrog (Smilisca phaeota) on dried fern, northwest Ecuador

Pete Oxford / Chachi Tree Frog (Hypsiboas picturatus), northwest Ecuador

Pete Oxford / Chachi Tree Frog (Hypsiboas picturatus), northwest Ecuador

Pete Oxford / Chachi Tree Frog (Hypsiboas picturatus), northwest Ecuador

Pete Oxford / Golden Palm Tree Frog (Dendropsophus ebraccatus), northwest Ecuador

Pete Oxford / Golden Palm Tree Frog (Dendropsophus ebraccatus), northwest Ecuador

Pete Oxford / Golden Palm Tree Frog (Dendropsophus ebraccatus) underside through glass, northwest Ecuador

Pete Oxford / Golden Palm Tree Frog (Dendropsophus ebraccatus), northwest Ecuador

Pete Oxford / Golden Palm Tree Frog (Dendropsophus ebraccatus), northwest Ecuador

Pete Oxford / Golden Palm Tree Frog (Dendropsophus ebraccatus), northwest Ecuador

Pete Oxford / Golden Palm Tree Frog (Dendropsophus ebraccatus), northwest Ecuador

Pete Oxford / Golden Palm Tree Frog (Dendropsophus ebraccatus) peeking through leaf, northwest Ecuador

Pete Oxford / Golden Palm Tree Frog (Dendropsophus ebraccatus) on fern, northwest Ecuador

Pete Oxford / Giant Gladiator Treefrog (Hypsiboas boans), northwest Ecuador

Pete Oxford / Giant Gladiator Treefrog (Hypsiboas boans), northwest Ecuador

Pete Oxford / Splendid Poison Dart Frog (Dendrobates sylvaticus), northwest Ecuador

Pete Oxford / Golden Palm Tree Frog (Dendropsophus ebraccatus), northwest Ecuador

Pete Oxford / Golden Palm Tree Frog (Dendropsophus ebraccatus), northwest Ecuador

Pete Oxford / Splendid Poison Dart Frog (Dendrobates sylvaticus), northwest Ecuador

Pete Oxford / Anolis Lizard (Anolis sp) male extending dewlap, northwest Ecuador

Pete Oxford / Marbled Tree Frog (Hyla marmorata), Napo River, Yasuni National Park, Amazon, Ecuador

Pete Oxford / Marbled Tree Frog (Hyla marmorata) camouflaged on bark, Napo River, Yasuni National Park, Amazon, Ecuador