Young Galapagos sea lions (Zalophus wollebaeki) at play underwater in the Galapagos Island Archipelago, UNESCO World Heritage Site, Ecuador, South America

Hippopotamus (Hippopotamus Amphibious), Zambia, Africa

Hippopotamus (Hippopotamus Amphibious), Zambia, Africa

Hippopotamus (Hippopotamus Amphibious), Zambia, Africa

Hippopotamus among river cabbage, Grumeti, Tanzania

Hippopotamuses, Ngoro, Tanzania, East Africa

Hippo, (Hippopotamus amphibious) is challenging, open mouth and teeth. Angry facial expression. Behind the hippo pod. Kwando River, Bwabwata National Park, Namibia, Africa

Hippo, (Hippopotamus amphibious) challenging with wide open mouth in Kwando River. Bwabwata National Park, Namibia, Africa

Hippo, (Hippopotamus amphibious) challenging in Kwando River. Bwabwata National Park, Namibia, Africa