Morley Read / Close-up of Agua rica leaf frog (Phyllomedusa ecuatoriana) eggs after 18 days development, the tadpoles are fully developed and ready to hatch, Ecuador. Endangered. (non-ex)

Morley Read / Close-up of Agua rica leaf frog (Phyllomedusa ecuatoriana) eggs after 11 days development, showing beating heart and blood flowing over gills, Ecuador. Endangered. (non-ex)

Alex Hyde / Lemur leaf frog (Agalychnis lemur) Central Caribbean foothills, Costa Rica. IUCN Red List critically endangered species.

Nick Garbutt / Wallace's Flying frog (Rhacophorus nigropalmatus) male from lowland dipterocarp rainforest, Danum Valley, Sabah, Borneo. Photographed in situ in makeshift studio in the forest.

Nick Garbutt / Wallace's flying frog (Rhacophorus nigropalmatus) male from lowland dipterocarp rainforest, Danum Valley, Sabah, Borneo. Photographed in situ in makeshift studio in the forest.

Doug Wechsler / Barking treefrog (Hyla gratiosa) male singing. Blackbird State Forest, Delaware, USA

Doug Wechsler / Pine Barrens Treefrog singing, Delaware, Blackbird State Forest, USA

Pete Oxford / Chachi tree frog {Hyla picturata} Choco forest, Ecuador

Morley Read / Close-up of Leaf frog (Cruziohyla craspedopus) tadpoles developing within an egg membrane, blood is circulating in the gills. Pastaza Province, Ecuador. (non-ex)

Morley Read / Close-up of Leaf frog (Cruziohyla craspedopus) tadpoles developing within an egg membrane, blood is circulating in the gills. Pastaza Province, Ecuador. (non-ex)

Morley Read / Two Leaf frogs (Cruziohyla craspedopus), with a rainforest stream in background, Napo Province, Ecuador. (non-ex)

Morley Read / Two Leaf frogs (Cruziohyla craspedopus), with a rainforest stream in background, Napo Province, Ecuador. (non-ex)

Morley Read / Close-up of Agua rica leaf frog (Phyllomedusa ecuatoriana) eggs after 18 days development, the tadpoles are fully developed and ready to hatch, Ecuador. Endangered. (non-ex)

Morley Read / Close-up of Agua rica leaf frog (Phyllomedusa ecuatoriana) eggs after 18 days development, the tadpoles are fully developed and ready to hatch, Ecuador. Endangered. (non-ex)

Morley Read / Close-up of Agua rica leaf frog (Phyllomedusa ecuatoriana) eggs after 18 days development, the tadpoles are fully developed and ready to hatch, Ecuador. Endangered. (non-ex)

Morley Read / Close-up of Agua rica leaf frog (Phyllomedusa ecuatoriana) eggs after 18 days development, the tadpoles are fully developed and ready to hatch, Ecuador. Endangered. (non-ex)

Morley Read / Close-up of Agua rica leaf frog (Phyllomedusa ecuatoriana) eggs after 18 days development, the tadpoles are fully developed and ready to hatch, Ecuador. Endangered. (non-ex)

Morley Read / Close-up of Agua rica leaf frog (Phyllomedusa ecuatoriana) eggs after 15 days development, the tadpoles are nearly developed, Ecuador. Endangered. (non-ex)

Morley Read / Close-up of Agua rica leaf frog (Phyllomedusa ecuatoriana) eggs after 15 days development, the tadpoles are nearly developed, Ecuador. Endangered. (non-ex)

Morley Read / Close-up of Agua rica leaf frog (Phyllomedusa ecuatoriana) eggs after 15 days development, the tadpoles are nearly developed, Ecuador. Endangered. (non-ex)

Morley Read / Close-up of Agua rica leaf frog (Phyllomedusa ecuatoriana) eggs after 11 days development, showing beating heart and blood flowing over gills, Ecuador. Endangered. (non-ex)

Morley Read / Close-up of Agua rica leaf frog (Phyllomedusa ecuatoriana) eggs after 11 days development, showing beating heart and blood flowing over gills, Ecuador. Endangered. (non-ex)

Morley Read / Close-up of Agua rica leaf frog (Phyllomedusa ecuatoriana) eggs after 10 days development, showing beating heart and blood flowing over gills, Ecuador. Endangered. (non-ex)

Morley Read / Close-up of Agua rica leaf frog (Phyllomedusa ecuatoriana) eggs after 11 days development, showing beating heart and blood flowing over gills, Ecuador. Endangered. (non-ex)

Morley Read / Close-up of Agua rica leaf frog (Phyllomedusa ecuatoriana) eggs after 9 days, external gills have formed but eye and blood still unpigmented, Ecuador. (non-ex)

Morley Read / Close-up of Agua rica leaf frog (Phyllomedusa ecuatoriana) eggs after 15 days development, the tadpoles are nearly developed, Ecuador. Endangered. (non-ex)

Morley Read / Close-up of Agua rica leaf frog (Phyllomedusa ecuatoriana) eggs after 15 days development, the tadpoles are nearly developed, Ecuador. Endangered. (non-ex)

Morley Read / Close-up of Agua rica leaf frog (Phyllomedusa ecuatoriana) eggs after 10 days development, showing beating heart and blood flowing over gills, Ecuador. Endangered. (non-ex)

Lucas Bustamante / Two Imbabura tree frogs (Hypsiboas picturatus) on log, Canande, Esmeraldas, Ecuador.

Alex Hyde / Veragua cross-banded treefrogs (Smilisca sordida) mating pair at night, Osa Peninsula, Costa Rica

Edwin Giesbers / Yellow-spotted tree frog (Leptopelis flavomaculatus) portrait of juvenile, captive occurs in Africa.

Edwin Giesbers / Uluguru forest tree frog (Leptopelis uluguruensis) captive, endemic to Tanzania. Vulnerable species.

Edwin Giesbers / Amani forest treefrog (Leptopelis vermiculatus) captive, endemic to Tanzania. Endangered species.

Simon Colmer / Tree frog (Leptopelis sp) Budongo Forest Reserve, Uganda.

Simon Colmer / Tree frog (Leptopelis sp) Budongo Forest Reserve, Uganda.

LYNN M. STONE / Big-Eyed Treefrog (Leptopelis vermiculatus) captive from forests of Tanzania. Non-exclusive

LYNN M. STONE / Big-Eyed Treefrog (Leptopelis vermiculatus) captive, from forests of Tanzania

Bert Willaert / Emerald Forest Frog (Hylorina sylvatica) on moss, Chile, January

Bert Willaert / Emerald Forest Frog (Hylorina sylvatica) on moss, Chile, January

Bert Willaert / Emerald Forest Frog (Hylorina sylvatica) on moss, Chile, January

Bert Willaert / Emerald Forest Frog (Hylorina sylvatica) on moss, Chile, January

Nick Garbutt / Wallace's flying frog (Rhacophorus nigropalmatus) male flying / gliding down from the canopy to temporary pools on the forest floor. Lowland dipterocarp rainforest, Danum Valley, Sabah, Borneo

John Abbott / Northern cricket frog (Acris crepitans) camouflaged on rock, Angelina National Forest, Texas, USA, March

Nature Production / Forest Green Treefrog (Rhacophorus arboreus) several males attempting to mate with one larger female who is laying eggs in foam in a tree, Japan

Doug Wechsler / Western chorus frog (Pseudacris triseriata kalmi) male calling, with vocal sac inflated. In vernal pool, Wharton State Forest, Western, USA. March

Alex Hyde / Brown Mantella frog {Mantella betsileo} camouflaged in leaf litter, dry deciduous forest, Kirindy Forest. Western Madagascar.

Nick Garbutt / Madagascar Reed frog (Heterixalus madagascariensis) on tropical forest foliage, Masoala National Park, Madagascar.

Juan Carlos Munoz / Bornean eared frog (Polypedates otilophus) Danum Valley forest reserve, Sabah, Borneo, Malaysia

Juan Carlos Munoz / Bornean eared frog (Polypedates otilophus) mating pair, Danum Valley forest reserve, Sabah, Borneo, Malaysia

Barry Mansell / Forest treefrog {Leptopelis natalensis} captive, from Africa

Pete Oxford / White-lipped tree frog (Boophis albilabris albilabris) female, rainforest, NE MADAGASCAR, endemic

Nature Production / Forest Green Tree frog {Rhacophorus arboreus} tadpole (49mm in length, with hind legs) sequence 3/4

Nature Production / Forest Green Tree frog {Rhacophorus arboreus} tadpole (34mm in length) sequence 2/4

Nature Production / Forest Green Tree frog {Rhacophorus arboreus} tadpole (16mm in length) sequence 1/4

Nature Production / Forest Green Tree frog {Rhacophorus arboreus} tadpole (49mm in length, with fore and hind leags) sequence 4/4

Pete Oxford / Tree frog {Hyla carnifex} cloud forest, Ecuador

Pete Oxford / Tree frog {Hyla carnifex} cloud forest, Ecuador

Pete Oxford / Tree frog {Hyla carnifex} cloud forest, Ecuador

Pete Oxford / Tree frog {Hyla carnifex} cloud forest, Ecuador

Nick Garbutt / Fandrefiala culubrid snake swallowing tree frog {Ithycyphus perineti} Madagascar

Doug Wechsler / Barking treefrog resting at day roost (Hyla gratiosa) Blackbird State Forest, Delaware, USA

Doug Wechsler / Barking treefrog at day roost (Hyla gratiosa)Blackbird State Forest, Delaware, USA

Doug Wechsler / Pine Barrens treefrog singing (Hyla andersoni) Blackbird State Forest, Delaware, USA

Nick Garbutt / Masked Tree Frog {Rhacophorus angulirostris} portrait, mid-altitude montane forest, Mt Kinabalu, Sabah, Borneo.

Steven David Miller / Eastern Dwarf Tree Frog {Litoria fallax} resting on frond, Duffy's Forest, New South Wales, Australia.

Doug Wechsler / Barking Treefrog roosting (Hyla gratiosa) Blackbird State Forest, Delaware, USA

Pete Oxford / Giant tree frog {Boophis albilabris} La Madraka Farm, Madagascar

Pete Oxford / Chachi tree frog {Hyla picturata} Choco forest, Ecuador

Pete Oxford / Chachi tree frog {Hyla picturata} Choco forest, Ecuador

Pete Oxford / Chachi tree frog {Hyla picturata} Choco forest, Ecuador

Pete Oxford / Chachi tree frog {Hyla picturata} Choco forest, Ecuador

Pete Oxford / Chachi tree frog {Hyla picturata} Choco forest, Ecuador

Pete Oxford / Treefrog climbing {Hyla carnifex} Cloud forest, Ecuador

Pete Oxford / Male Strawberry tree frog {Hyla pantosticta} Cloud forest (2500m) Ecuador

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

Pete Oxford / Male Strawberry tree frogs {Hyla pantosticta} Cloud forest (2500m) Ecuador

Pete Oxford / Male Strawberry tree frog {Hyla pantosticta} Cloud forest (2500m) Ecuador

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

Pete Oxford / Marsupial frog {Gastrotheca orophylax} in bromeliad, Cloud forest, Ecuador

Pete Oxford / Male Strawberry tree frog {Hyla pantosticta} Cloud forest (2500m) Ecuador

Mark Moffett / Strawberry Poison Dart Frog (Oophaga pumilio) mother carries tadpole to canopy, she lacks the toe pads or other adaptations of tree frogs and so the trip is quite arduous, Bastimentos Island, Bocas de...

David Shale / Coast foam nesting treefrogs with foam {Chiromantis xerampelina} Arabuko Sokoke

David Shale / Coast foam nesting treefrogs mating in foam {Chiromantis xerampelina} Arabuko Sokoke

David Shale / Coast foam nesting treefrogs mating in foam {Chiromantis xerampelina} Arabuko Sokoke

David Shale / Coast foam nesting tree frogs with foam {Chiromantis xerampelina} Kenya Arabuko

David Shale / Coast foam nesting treefrog tadpoles in foam {Chiromantis xerampelina} Arabuko Sokoke

David Shale / Coast foam nesting treefrog, white in sunlight {Chiromantis xerampelina} Kenya

David Shale / Coast foam nesting treefrog tadpoles in foam {Chiromantis xerampelina} Arabuko Sokoke

Doug Wechsler / Pine barrens treefrog (Hyla andersoni) singing. Blackbird State Forest, Delaware, USA

Nick Garbutt / Central bright eyed frog {Boophis rappiodes} Mantadia National Park, Madagascar

David Shale / Ornate tree frog {Leptopelis flavomaculatus} Arabuko Sokoke forest, Kenya

David Shale / Ornate tree frog {Leptopelis flavomaculatus} Arabuko Sokoke forest, Kenya

David Shale / Ornate tree frog {Leptopelis flavomaculatus} Arabuko Sokoke forest, Kenya

David Shale / Ornate tree frog {Leptopelis flavomaculatus} Arabuko Sokoke forest, Kenya

David Shale / Ornate tree frog {Leptopelis flavomaculatus} Arabuko Sokoke forest, Kenya

Jabruson / Treefrog emerging from forest to hunt insects {Rhacophoridae} Odzala NP, Congo