Nick Garbutt / Yacare Caiman (Caiman yacare) gaping to regulate its body temperature, with attendant hoverflies, the Paraguay River, Taiama Reserve, western Pantanal, Brazil, South America.

Luciano Candisani / Jacare Caiman (Caiman yacare) young in wetland, Pantanal, Brazil

Luciano Candisani / Jacare Caiman (Caiman yacare) two weeks old young in wetland, Pantanal, Brazil

Luciano Candisani / Jacare Caiman (Caiman yacare) waiting for fish to swim through open mouth in wetland, Pantanal, Brazil

Luciano Candisani / Jacare Caiman (Caiman yacare) standing on bottom of wetland, Pantanal, Brazil

Luciano Candisani / Jacare Caiman (Caiman yacare) swimming away, wetland, Pantanal, Brazil

Luciano Candisani / Jacare Caiman (Caiman yacare) waiting for fish to swim through open mouth in wetland, Pantanal, Brazil

Luciano Candisani / Jacare Caiman (Caiman yacare)fishing in wetland, Pantanal, Brazil

Luciano Candisani / Jacare Caiman (Caiman yacare) fishing in flooded plain, Pantanal, Brazil

Luciano Candisani / Jacare Caiman (Caiman yacare) in forest, Pantanal, Brazil

Luciano Candisani / Jacare Caiman (Caiman yacare) group in wetland at night, Pantanal, Brazil

Luciano Candisani / Jacare Caiman (Caiman yacare) baby seen from below, Brazil

Luciano Candisani / Jacare Caiman (Caiman yacare) with open mouth, Pantanal, Brazil

Franco Banfi / Detail of the leg of a Yacare caiman (Caiman yacare), Paraguay river, Pantanal wetlands, Mato Grosso, Brazil

Franco Banfi / Yacare caiman (Caiman yacare), Paraguay river, Pantanal wetlands, Mato Grosso, Brazil

Franco Banfi / Yacare caiman (Caiman yacare), Paraguay river, Pantanal wetlands, Mato Grosso, Brazil

Franco Banfi / Yacare caiman (Caiman yacare) Paraguay river, Pantanal wetlands, Mato Grosso, Brazil

Franco Banfi / Yacare caiman (Caiman yacare),basking in the sun, Paraguay river, Pantanal wetlands, Mato Grosso, Brazil

Franco Banfi / Yacare caiman (Caiman yacare), peering out of water, Paraguay river, Pantanal wetlands, Mato Grosso, Brazil

Franco Banfi / View finder of camera showing Yacare caiman (Caiman yacare), Paraguay river, Pantanal wetlands, Mato Grosso, Brazil

Franco Banfi / Camera viewfinder with Yacare caiman (Caiman yacare) in frame, Paraguay river, Pantanal wetlands, Mato Grosso, Brazil

Sebastian Kennerknecht / Jacare Caiman (Caiman yacare), Ibera Provincial Reserve, Ibera Wetlands, Argentina

Thomas Marent / Jacare Caiman (Caiman yacare) group basking on shore, Pantanal, Mato Grosso, Brazil

Thomas Marent / Jacare Caiman (Caiman yacare) baby, Pantanal, Mato Grosso, Brazil

Thomas Marent / Jacare Caiman (Caiman yacare) thermoregulating, Pantanal, Mato Grosso, Brazil

Thomas Marent / Jacare Caiman (Caiman yacare) thermoregulating, Pantanal, Mato Grosso, Brazil

Thomas Marent / Jacare Caiman (Caiman yacare) group basking, Pantanal, Mato Grosso, Brazil

Nate Chappell/ BIA / Jacare Caiman (Caiman yacare) with water vegetation on head, Pantanal, Brazil

Sean Crane / Jacare Caiman (Caiman yacare) at sunset, Pantanal, Brazil

Suzi Eszterhas / American Black Vulture (Coragyps atratus) landing on Jacare Caiman (Caiman yacare) carcass, Pantanal, Brazil

Suzi Eszterhas / Jacare Caiman (Caiman yacare), Great Egret (Ardea alba), Limpkin (Aramus guarauna), Jabiru (Jabiru mycteria), Wood Stork (Mycteria americana), Snowy Egret (Egretta thula), White-necked Heron (Ardea co...

Luciano Candisani / Jacare Caiman (Caiman yacare) young, Pantanal, Brazil

Luciano Candisani / Jacare Caiman (Caiman yacare) young, Pantanal, Brazil

Luciano Candisani / Jacare Caiman (Caiman yacare) waiting for fish to swim through open mouth in wetland, Pantanal, Brazil

Luciano Candisani / Jacare Caiman (Caiman yacare) young in wetland, Pantanal, Brazil

Luciano Candisani / Jacare Caiman (Caiman yacare) young in wetland, Pantanal, Brazil

Luciano Candisani / Jacare Caiman (Caiman yacare) fishing, Pantanal, Brazil

Luciano Candisani / Jacare Caiman (Caiman yacare) waiting for fish to swim through open mouth in wetland, Pantanal, Brazil

Luciano Candisani / Jacare Caiman (Caiman yacare) pair waiting for fish to swim through open mouth in wetland, Pantanal, Brazil

Luciano Candisani / Jacare Caiman (Caiman yacare) pair waiting for fish to swim through open mouth in wetland, Pantanal, Brazil

Luciano Candisani / Jacare Caiman (Caiman yacare) waiting for fish to swim through open mouth in wetland, Pantanal, Brazil

Luciano Candisani / Jacare Caiman (Caiman yacare) waiting for fish to swim through open mouth in wetland, Pantanal, Brazil

Luciano Candisani / Jacare Caiman (Caiman yacare) males displaying to establish dominance, Pantanal, Brazil

Luciano Candisani / Jacare Caiman (Caiman yacare) fishing, Pantanal, Brazil

Luciano Candisani / Jacare Caiman (Caiman yacare) in wetland, Pantanal, Brazil

Sean Crane / Jacare Caiman (Caiman yacare), Pantanal, Brazil

Sean Crane / Jacare Caiman (Caiman yacare), Pantanal, Brazil

Sean Crane / Jacare Caiman (Caiman yacare), Pantanal, Brazil

Pete Oxford / Jacare Caiman (Caiman yacare), Pantanal, Mato Grosso, Brazil

Pete Oxford / Jacare Caiman (Caiman yacare), Pantanal, Mato Grosso, Brazil

Pete Oxford / Jacare Caiman (Caiman yacare), Pantanal, Mato Grosso, Brazil

Pete Oxford / Jacare Caiman (Caiman yacare), Pantanal, Mato Grosso, Brazil

Luiz Claudio Marigo / Paraguay Caiman (Caiman yacare) feeding on fish, on banks of Piquiri River, Pantanal of Mato Grosso, Mato Grosso State, Western Brazil.

Luiz Claudio Marigo / Paraguay Caiman (Caiman yacare) feeding on fish, in Piquiri River, Pantanal of Mato Grosso, Mato Grosso State, Western Brazil.

Luiz Claudio Marigo / Paraguay Caiman (Caiman yacare) feedin on fish, in Piquiri River, Pantanal of Mato Grosso, Mato Grosso State, Western Brazil.

Luciano Candisani / Jacare Caiman (Caiman yacare) emerging from river, Pantanal, Brazil

Luciano Candisani / Jacare Caiman (Caiman yacare) pair in flooded field, rainy season, Pantanal, Brazil

Luciano Candisani / Jacare Caiman (Caiman yacare) and rainbow during dry season, Pantanal, Brazil

Luciano Candisani / Jacare Caiman (Caiman yacare) gathering at water's edge during dry season, Pantanal, Brazil

Luciano Candisani / Jacare Caiman (Caiman yacare) pair sunning on sandbar, Pantanal, Brazil

Luciano Candisani / Jacare Caiman (Caiman yacare) group, Pantanal, Brazil

Luciano Candisani / Jacare Caiman (Caiman yacare) thermoregulating, Pantanal, Brazil

Luciano Candisani / Jacare Caiman (Caiman yacare) on shore, Pantanal, Brazil

Luciano Candisani / Jacare Caiman (Caiman yacare) fishing in flowing river, Pantanal, Brazil

Pete Oxford / Jacare Caiman (Caiman yacare) group on riverbank, Pantanal, Brazil

Pete Oxford / Jacare Caiman (Caiman yacare) thermoregulating on riverbank, Pantanal, Brazil

Pete Oxford / Jacare Caiman (Caiman yacare) on riverbank, Pantanal, Brazil

Pete Oxford / Jacare Caiman (Caiman yacare), Pantanal, Brazil

Pete Oxford / Jacare Caiman (Caiman yacare), Pantanal, Brazil

Pete Oxford / Jacare Caiman (Caiman yacare) thermoregulating on in shallow water, Pantanal, Brazil

Pete Oxford / Jacare Caiman (Caiman yacare) on floating vegetation, Pantanal, Brazil

Pete Oxford / Jacare Caiman (Caiman yacare) on riverbank, Pantanal, Brazil

Pete Oxford / Jacare Caiman (Caiman yacare) on riverbank, Pantanal, Brazil

Pete Oxford / Jacare Caiman (Caiman yacare) thermoregulating on riverbank, Pantanal, Brazil

Luciano Candisani / Jacare Caiman (Caiman yacare) sunning on river bank, Pantanal, Brazil

Luciano Candisani / Jacare Caiman (Caiman yacare) with open mouth, Pantanal, Brazil

Luciano Candisani / Jacare Caiman (Caiman yacare) sunning on sandbar, Pantanal, Brazil

Luciano Candisani / Jacare Caiman (Caiman yacare) fishing in flowing river, Pantanal, Brazil

Theo Allofs / Jacare Caiman (Caiman yacare) babies huddling together in shallow water, Pantanal, Brazil

Theo Allofs / Jacare Caiman (Caiman yacare) panting to keep cool, Pantanal, Brazil

Luciano Candisani / Jacare Caiman (Caiman yacare) group fishing by opening mouths and waiting for prey, Pantanal Ecosystem, Brazil

Luciano Candisani / Jacare Caiman (Caiman yacare) thermoregulating, Pantanal Ecosystem, Brazil

Theo Allofs / Jacare Caiman (Caiman yacare) with fresh caught fish in mouth, Mato Grosso, Pantanal, Brazil

Theo Allofs / Jacare Caiman (Caiman yacare) swimming, Pantanal, Brazil

Theo Allofs / Jacare Caiman (Caiman yacare) group, Great Egret (Ardea alba) and Snowy Egret (Egretta thula) waiting for prey, Pantanal, Brazil

Theo Allofs / Jacare Caiman (Caiman yacare) jumping out of water, Pantanal, Brazil

Theo Allofs / Jacare Caiman (Caiman yacare) waiting for prey, Mato Grosso, Pantanal, Brazil

Theo Allofs / Jacare Caiman (Caiman yacare) young huddling around mother, Pantanal, Brazil

Theo Allofs / Jacare Caiman (Caiman yacare) mother with young, Pantanal, Brazil

Theo Allofs / Jacare Caiman (Caiman yacare) in water plants, Pantanal, Brazil

Theo Allofs / Jacare Caiman (Caiman yacare) with head reflected in lagoon, Pantanal, Brazil

Theo Allofs / Jacare Caiman (Caiman yacare) pair resting at twilight in grasses near lagoon, Pantanal, Brazil

Theo Allofs / Jacare Caiman (Caiman yacare) surrounded by water hyacinths, Pantanal, Brazil

Theo Allofs / Giant River Otter (Pteronura brasiliensis) an endangered species, eating fish in shallow water with Jacare Caiman (Caiman yacare) approaching, Pantanal, Brazil

Claus Meyer / Jacare Caiman (Caiman yacare) resting in shallow water, thermoregulating by opening jaws, Pantanal ecosystem, Brazil

Claus Meyer / Jacare Caiman (Caiman yacare) walking in water, mouth partially open, ecosystem of Pantanal, Brazil