Staffan Widstrand / African Foamnest frog (Chiromantis rufescens), Hwange N P, Zimbabwe

Christian Ziegler / Red-eyed Tree Frog (Agalychnis callidryas) being consumed by Foam-nest Frog (Leptodactylus sp), Soberania National Park, Panama

Pete Oxford / Smokey Jungle Frog (Leptodactylus pentadactylus), Yasuni National Park, Amazon, Ecuador

Luciano Candisani / Crilloa Frog (Leptodactylus ocellatus) showing ear, Sao Paulo, Brazil

Luciano Candisani / Crilloa Frog (Leptodactylus ocellatus), Sao Paulo, Brazil

Chien Lee / Harlequin Flying Tree Frog (Rhacophorus pardalis) males competing for female making a foam nest, Kubah National Park, Sarawak, Borneo, Malaysia

Pete Oxford / Mexican White-lipped Frog (Leptodactylus fragilis), Hato Masaguaral working farm and biological station, Venezuela

Pete Oxford / Knudsen's Frog (Leptodactylus knudseni), Iwokrama Rainforest Reserve, Guyana

Pete Oxford / Knudsen's Frog (Leptodactylus knudseni), Iwokrama Rainforest Reserve, Guyana

Tim Laman / Wallace's flying frog (Rhacophorus nigropalmatus) foam nest with eggs above a pig wallow pool in the lowland rainforest of Danum Valley Conservation Area, Sabah, Borneo, Malaysia.

Murray Cooper / Smokey Jungle Frog (Leptodactylus pentadactylus) camouflaged in leaf litter, Amazon, Ecuador

James Christensen / Smokey Jungle Frog (Leptodactylus pentadactylus) with injured jaw, Colon, Panama

Piotr Naskrecki / African Foam-nest Treefrog (Chiromantis rufescens), Atewa Range, Ghana

Piotr Naskrecki / African Foam-nest Treefrog (Chiromantis rufescens) pair in amplexus, Atewa Range, Ghana

James Christensen / Tungara Frog (Physalaemus pustulosus) pair in amplexus at night, building foam nest for eggs, Panama

Michael & Patricia Fogden / Grey Tree Frog (Chiromantis xerampelina) group foam nesting over seasonal pond, South Africa

PREMAPHOTOS / Andean foam-nest frog (Pleurodema cinerea) male calling with inflated throat-sac, at an altitude of 4000m in the Bolivian Andes

Christian Ziegler / Foam-nest Frog (Leptodactylus sp) feeding on a Red-eyed Tree Frog (Agalychnis callidryas) at a mating pond, Soberania National Park, Panama

Nature Production / Siamese Fighting Fish {Betta splendens} making a foam nest of bubbles to attract female to lay eggs in, captive

Nature Production / Froghopper / Spittlebug larvae {Aphrophora intermedia} nest of foam, Japan

Nature Production / Froghopper / Spittlebug larvae {Aphrophora intermedia} creating foam nest, Japan

PREMAPHOTOS / Andean foam-nest frog (Pleurodema cinerea), male and female making their foam nest during the day, Andes at 4300m, Bolivia

PREMAPHOTOS / Coast Foam-nesting Tree Frog / Southeastern Foam-nest Tree Frogs / African Grey Frogs (Chiromantis xerampelina) making foam nest at night in the savanna, South Africa

Ken Preston-Mafham/PREMAPHOTOS / File-eared Tree Frog / Stripped Treefrog / Yellow Foam-nest Frog (Polypedates leucomystax), pair making foam nest in rainforest, Malaysia

Michael & Patricia Fogden / Smokey Jungle Frog (Leptodactylus pentadactylus) predating Masked Puddle Frog (Smilisca phaeota), Costa Rica

Nick Garbutt / Bornean eared tree frog (Polypedates otilophus) pair in amplexus with foam egg nest in beams of shlelter, Danum Valley, Sabah, Borneo.

Kim Taylor / Froghopper (Philaenus spumarius) froth nest (cuckoo spit) made by nymph on grass, UK

Michael & Patricia Fogden / Grey Tree Frog (Chiromantis xerampelina) tadpoles dropping from foam nest, seasonal ponds, savannah, South Africa

Michael & Patricia Fogden / Grey Tree Frog (Chiromantis xerampelina) tadpoles dropping from foam nest, seasonal ponds, savannah, South Africa

Michael & Patricia Fogden / Grey Tree Frog (Chiromantis xerampelina) group co-operative foam nesting, seasonal ponds, savannah, South Africa

Michael & Patricia Fogden / Grey Tree Frog (Chiromantis xerampelina) group co-operative foam nesting, seasonal ponds, savannah, South Africa

Claus Meyer / Crilloa Frog (Leptodactylus ocellatus), southern Brazil

Michael & Patricia Fogden / Smokey Jungle Frog (Leptodactylus pentadactylus) tadpoles eating eggs of Tarraco Treefrog (Smilisca phaeota) in rainforest, Costa Rica

Michael & Patricia Fogden / Tungara Frog (Physalaemus pustulosus) pair spawning in foam nest, rainforest, Panama

Claus Meyer / Labyrinth Frog (Leptodactylus labyrinthicus) portrait, Caatinga ecosystem, Brazil

Claus Meyer / Crilloa Frog (Leptodactylus occelatus) portrait, southern Brazil

Michael & Patricia Fogden / Grey Tree Frog (Chiromantis xerampelina) group co-operative foam nesting, seasonal ponds, savannah, South Africa

Mark Moffett / Foam Nest Tree Frog (Polypedates dennysi) newly identified species of Gliding Frog, the largest in the world, Tam Dao National Park, Vietnam

David Shale / Spiny reed frog {Afrixalus fornasinii} feeding on Foam nest treefrog tadpoles, Kenya

PREMAPHOTOS / Group of Coast foam-nesting tree frogs (Chiromantis xerampelina) making their nest at night, South Africa

PREMAPHOTOS / Group of Coast foam-nesting tree frogs (Chiromantis xerampelina) making their nest at night, South Africa

PREMAPHOTOS / Andean foam-nest frog (Pleurodema cinerea), foam nests in a temporary seasonal pool at an altitide of 4000m in the Bolivian Andes

PREMAPHOTOS / Coast foam-nesting tree frog (Chiromantis xerampelina) camouflaged against a dead tree, beside its foam nest, South Africa

PREMAPHOTOS / Coast foam-nesting tree frog (Chiromantis xerampelina) camouflaged against a dead tree, beside its foam nest, South Africa

Nature Production / Paradise Fish {Macropodus opercularis} looking after juveniles in a nest of foam, Japan

Mark Moffett / Russian Herpetologist Nikolai Orlov holding Foam Nest Tree Frog (Polypedates dennysi) newly identified species of Gliding Frog, the largest in the world, Tam Dao National Park, Vietnam

David Shale / Spiny reed frog {Afrixalus fornasinii} feeding on Foam nest tadpoles Kenya Arabuko Sokoke