Bert Willaert / Titicaca water frog (Telmatobius culeus) swimming underwater, Lake Titicaca, Bolivia. Critically endangered species.

Bert Willaert / Titicaca water frog (Telmatobius culeus) underwater resting on the lake bed, Lake Titicaca, Bolivia. Critically endangered species.

Chris Mattison / Solomon Islands leaf frog / Eyelash frog or Guenther's triangle frog (Cornufer guentheri, formerly Ceratobatrachus guentheri) captive

Chris Mattison / Solomon Islands leaf frog / Eyelash frog or Guenther's triangle frog (Cornufer guentheri, formerly Ceratobatrachus guentheri) captive

Chris Mattison / Solomon Islands leaf frog / Eyelash frog or Guenther's triangle frog (Cornufer guentheri, formerly Ceratobatrachus guentheri) captive

Cyril Ruoso / Lake Titicaca frog (Telmatobius culeus) in man's hands, part of controversial ecotourism project about Lake Titicaca's fauna and flora, Peru

Cyril Ruoso / Lake Titicaca frog (Telmatobius culeus) underwater in Lake Titicaca, Bolivia

Cyril Ruoso / Lake Titicaca frog (Telmatobius culeus) with biologist Arthuro Nunoz diving underwater with frog, a species threatened by poaching, Lake Titicaca, Bolivia

Cyril Ruoso / Lake Titicaca frog (Telmatobius culeus) with biologist Arthuro Nunoz diving underwater with frog, a species threatened by poaching, Lake Titicaca, Bolivia

Bert Willaert / Titicaca water frog (Telmatobius culeus) swimming underwater, Lake Titicaca, Bolivia. Critically endangered species.

Bert Willaert / Titicaca water frog (Telmatobius culeus) swimming underwater, Lake Titicaca, Bolivia. Critically endangered species.

Bert Willaert / Titicaca water frog (Telmatobius culeus) swimming underwater, Lake Titicaca, Bolivia. Critically endangered species.

Bert Willaert / Titicaca water frog (Telmatobius culeus) swimming underwater, Lake Titicaca, Bolivia. Critically endangered species.

Bert Willaert / Titicaca water frog (Telmatobius culeus) underwater resting on the lake bed, Lake Titicaca, Bolivia. Critically endangered species.

Bert Willaert / Titicaca water frog (Telmatobius culeus) underwater resting on the lake bed, Lake Titicaca, Bolivia. Critically endangered species.

Bert Willaert / Titicaca water / Lake Titicaca frog (Telmatobius culeus) in aquarium, Captive Breeding Facility, Cochabamba, Bolivia, October, Critically endangered species.

Bert Willaert / Titicaca water / Lake Titicaca frog (Telmatobius culeus) camouflaged amongst stones, Lake Titicaca, Bolivia, October, Critically endangered.

Bert Willaert / Dead Titicaca water / Lake Titicaca frog (Telmatobius culeus) on bottom on lake, Lake Titicaca, Bolivia, October, Critically endangered.

Bert Willaert / Titicaca water / Lake Titicaca frog (Telmatobius culeus) on bottom of lake, Lake Titicaca, Bolivia, October, Critically endangered.

Bert Willaert / Titicaca water / Lake Titicaca frog (Telmatobius culeus) amongst stones on the bottom of the lake, Lake Titicaca, Bolivia, October, Critically endangered.

Bert Willaert / Light coloured Titicaca water / Lake Titicaca frog (Telmatobius culeus) resting, Lake Titicaca, Bolivia, October, Critically endangered.

Bert Willaert / Titicaca water / Lake Titicaca frog (Telmatobius culeus) swimming, seen from below, Lake Titicaca, Bolivia, October, Critically endangered.

Bert Willaert / Researcher holding a Titicaca water / Lake Titicaca frog (Telmatobius culeus) underwater, Lake Titicaca, Bolivia, October, Critically endangered.

Bert Willaert / Titicaca water / Lake Titicaca frog (Telmatobius culeus) swimming towards camera looking into the lens, Lake Titicaca, Bolivia, October, Critically endangered.

Bert Willaert / Titicaca water / Lake Titicaca frog (Telmatobius culeus) swimming through vegetation, Lake Titicaca, Bolivia, October, Critically endangered.

Bert Willaert / Titicaca water / Lake Titicaca frog (Telmatobius culeus) on bottom of lake, Lake Titicaca, Bolivia, October, Critically endangered.

Frederique Olivier / Solomon Islands eyelash frog (Ceratobatrachus guentheri) sitting on leaf, Solomon Islands.

Frederique Olivier / Solomon Islands eyelash frog (Ceratobatrachus guentheri) on ground, Solomon Islands.

Frederique Olivier / Frog (Platymantis sp) pair sitting on leaf, Solomon Islands.

Frederique Olivier / Frog (Platymantis sp) sitting on leaf, Solomon Islands.

Frederique Olivier / Solomon Islands eyelash frog (Ceratobatrachus guentheri) portrait, Solomon Islands.

Mark MacEwen / Saggy skinned frog (Telmatobius culeus) adult in Lake Titicaca, Andes on the border of Peru and Bolivia

Joel Sartore / Photo Ark / Two Titicaca water frogs (Telmatobius culeus) portrait, Museo d'Orbigny, Bolivia. Captive. Endangered.

Joel Sartore / Photo Ark / Loa water frog (Telmatobius dankoi) underwater before swimming away, Santiago Zoo. Critically Endangered. Captive.

Joel Sartore / Photo Ark / Two Lake Titicaca water frogs (Telmatobius culeus) swimming and kicking each other, Museo d'Orbigny. Endangered. Captive.

Joel Sartore / Photo Ark / Sehuencas water frog (Telmatobius yuracare) male resting underwater, Museo d'Orbigny. Critically Endangered. Captive.

Joel Sartore / Photo Ark / Giant water frog (Telmatobius gigas) resting underwater, Museo d'Orbigny. Critically Endangered. Captive.

Joel Sartore / Photo Ark / Two Lake Titicaca water frogs (Telmatobius culeus) swimming and kicking each other, Museo d'Orbigny. Endangered. Captive.

Bert Willaert / Giant webbed frog (Cornufer guppyi / Discodeles guppyi) on white background, controlled conditions, Willaumez Peninsula, New Britain, Papua New Guinea, December

Bert Willaert / Giant webbed frog (Cornufer guppyi / Discodeles guppyi), Willaumez Peninsula, New Britain, Papua New Guinea, December