Lucas Bustamante / Troschel's tree frog / Calcar tree / Convict tree frog (Hypsiboas calcaratus) portrait, on leaf, Cuyabeno, Sucumbios, Ecuador.

Floris van Breugel / Sunrise over Mt Morrison in the far distance, near Convict Lake, Sierra Nevada, California, USA January

Juergen Freund / Convict blennies / False catfish, juvenile, (Pholidichthys leucotaenia) amidst a fan coral. Misool, Raja Ampat, West Papua, Indonesia,

Alex Mustard / Convict blennies (Pholidichthys leucotaenia) swim across a coral reef with seafan (Melithaea sp.) behind. Misool, Raja Ampat, West Papua, Indonesia. Misool Marine Protected Area. Ceram Sea. Tropical W...

David Hall / Convict snake eel (Leiuranus versicolor) on sea floor. Pantar, Alor Archipelago, Indonesia.

Gary Bell/ Oceanwide / Convict Surgeonfish (Acanthurus triostegus) school, Christmas Island, Australia

David Fleetham / Large school of Convict Surgeonfish / Tang (Acanthurus triostegus) on reef. Five images were digitally stitched to make this panorama. Yap, Micronesia.

Jordi Chias / Convict surgeonfish (Acanthurus triostegus) Gafu atoll, Indian Ocean, Maldives.

Jordi Chias / Convict surgeonfish (Acanthurus triostegus) Gafu atoll, Indian Ocean, Maldives.

Georgette Douwma / Convict blenny or False catfish (Pholidichthys leucotaenia). juveniles school in vast numbers over coral reefs. Ambon, Indonesia.

Floris van Breugel / Stormy winter winds over the ridges of Mount Morrison, near Convict Lake and Mammoth, Sierra Nevada, California, USA. January 2016.

Edwin Giesbers / Troschel's tree frog (Hyla calcaratus) captive, occurs in South America.

Nick Garbutt / Convict Tree Frog (Hypsiboas calcaratus) on a tree, Paujil Nature Reserve, Magdalena Valley, Colombia, South America.

MYN / Andrew Snyder / Convict treefrog (Hypsiboas calcaratus) Kanuku Mountains, Guyana. Meetyourneighbours.net project

GEORGETTE DOUWMA / Flase catfish (Pholidichthys leucotaenia) school of juveniles, Papua New Guinea.

GEORGETTE DOUWMA / Convict blenny / false catfish (Pholidichthys leucotaenia) school of juveniles, Papua New Guinea

GEORGETTE DOUWMA / Convict blenny / false catfish (Pholidichthys leucotaenia) school of juveniles, Papua New Guinea

GEORGETTE DOUWMA / Convict blenny / false catfish (Pholidichthys leucotaenia) school of juveniles, Papua New Guinea

GEORGETTE DOUWMA / Convict blenny / false catfish (Pholidichthys leucotaenia) school of juveniles, Papua New Guinea

GEORGETTE DOUWMA / Convict blenny / false catfish (Pholidichthys leucotaenia) juveniles emerging from burrow, Papua New Guinea

GEORGETTE DOUWMA / Convict blenny / false catfish (Pholidichthys leucotaenia) adult excavating its burrow, surrounded by school of juveniles, Papua New Guinea

GEORGETTE DOUWMA / Convict blenny / False catfish (Pholidichthys leucotaenia). School of juveniles. Lembeh Strait, North Sulawesi, Indonesia

Tim Fitzharris / Laurel Mountain reflected in Convict Lake, eastern Sierra Nevada, California

Tim Fitzharris / Laurel Mountain reflected in Convict Lake, eastern Sierra Nevada, California

Tim Fitzharris / Laurel Mountain dusted with snow overlooking Convict Lake, Sierra Nevada, California

Tim Fitzharris / Laurel Mountain and Convict Lake in winter, eastern Sierra Nevada, California

Tim Fitzharris / Laurel Mountain and Convict Lake framed by barren trees in winter, eastern Sierra Nevada, California

Tim Fitzharris / Laurel Mountain and Convict Lake in winter, eastern Sierra Nevada, California

Norbert Wu / Painted Greenling (Oxylebius pictus) hides in Sea Anemone for protection, California

Gary Bell/ Oceanwide / Convict Surgeonfish (Acanthurus triostegus) school, Christmas Island, Australia

David Fleetham / Convict tang (Acanthurus triostegus), feeding on filamentous algae, Rarotonga, Cook Islands.

David Fleetham / Convict surgeonfish (Acanthurus triostegus), sometimes referred to as the sub-species (Acanthurus sandvicensis) Hawaii.

GEORGETTE DOUWMA / School of Convict surgeonfish / Tangs {Acanthurus triostegus} Maldives

Alex Mustard / Convict blennies (Pholidichthys leucotaenia) shoal above a coral reef, Raja Ampat, West Papua, Ceram Sea, Pacific Ocean.

Alex Mustard / Shoal of Convict blennies (Pholidichthys leucotaenia) forming a tight ball, defensive behaviour, on a coral reef, Raja Ampat, West Papua, Ceram Sea, Pacific Ocean.

Joel Sartore / Photo Ark / Convict cichlid (Amatitlania nigrofasciata) portrait, Institute of Marine Mammal Studies. Captive, occurs in Central America.

Joel Sartore / Photo Ark / Convict cichlid (Amatitlania nigrofasciata) portrait, Institute of Marine Mammal Studies. Captive, occurs in Central America.

David Fleetham / Schooling Convict fish / Convict blennies (Pholidichthys leucotaenia) juveniles, in a tight ball formation, Philippines, Pacific Ocean.

Alex Mustard / Mixed school of diagonal-banded sweetlips (Plectorhinchus lineatus) and ribbon sweetlips (Plectorhinchus polytaenia) gather above plate corals, with convict blennies (Pholidichthys leucotaenia). Saund...

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

Alex Mustard / A mixed school of diagonal-banded sweetlips (Plectorhinchus lineatus) and ribbon sweetlips (Plectorhinchus polytaenia) gather above plate corals, with convict blennies (Pholidichthys leucotaenia). Sau...

Willem Kolvoort / Convict surgeon fish (Acanthurus triostegus) in Passe Dubois / Dubois channel, Aldabra, Indian Ocean