Juergen & Christine Sohns / Meerkat (Suricata suricatta) pair on alert, Tswalu Game Reserve, South Africa

Pete Oxford / Pacific Horned Frog (Ceratophrys stolzmanni), native to South America

Mark Raycroft / Shetland Sheepdog (Canis familiaris)

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)fishing in wetland, Pantanal, Brazil

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

Vincent Grafhorst / Hippopotamus (Hippopotamus amphibius) bull, Khwai River, Botswana

Cyril Ruoso / Bonobo (Pan paniscus) smiling while laying on ground, ABC Sanctuary, Democratic Republic of the Congo

Juergen Freund / Mareeba rock-wallaby (Petrogale mareeba) Queensland, Australia

Piotr Naskrecki / Turnip-tailed Gecko (Thecadactylus rapicauda), Suriname

Kevin Schafer / Amazon River Dolphin (Inia geoffrensis) swimming, Rio Negro, Amazonia, Brazil