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

Pete Oxford / Galapagos Sea Lion (Zalophus wollebaeki) mother nuzzling pup, Rabida Island, Galapagos Islands, Ecuador

Pete Oxford / Galapagos Sea Lion (Zalophus wollebaeki) mother nuzzling pup, Rabida Island, Galapagos Islands, Ecuador

Richard Du Toit / Impala (Aepyceros melampus) mother nuzzling one month old calf, Chobe National Park, Botswana

Thomas Marent / Japanese Macaque (Macaca fuscata) mother holding baby for warmth, Jigokudani, Nagano, Japan

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

ZSSD / Western Lowland Gorilla (Gorilla gorilla gorilla) juvenile