California sea lions (Zalophus californianus), stampeding on the beach in Puerto Refugio, Baja California, Sea of Cortez, Mexico, North America

California sea lion (Zalophus californianus), stampeding on the beach in Puerto Refugio, Baja California, Sea of Cortez, Mexico, North America

California sea lions (Zalophus californianus), stampeding on the beach in Puerto Refugio, Baja California, Sea of Cortez, Mexico, North America

California sea lions (Zalophus californianus), stampeding on the beach in Puerto Refugio, Baja California, Sea of Cortez, Mexico, North America

California sea lions (Zalophus californianus), stampeding on the beach in Puerto Refugio, Baja California, Sea of Cortez, Mexico, North America

California sea lions (Zalophus californianus), stampeding on the beach in Puerto Refugio, Baja California, Sea of Cortez, Mexico, North America

California sea lions (Zalophus californianus), stampeding on the beach in Puerto Refugio, Baja California, Sea of Cortez, Mexico, North America

California sea lion (Zalophus californianus) herd stampeding to the sea at Isla San Esteban, Baja California, Mexico, North America

Herd of wild horses on the Great Plain of Hungary at Bugac, Hungary

Herd of migrating Blue Wildebeest, Grumeti, Tanzania

Juvenile migrating Blue Wildebeest running, Grumeti, Tanzania

Migrating Blue Wildebeest running, Grumeti, Tanzania

Migrating Blue Wildebeest running , Grumeti, Tanzania

Migrating Blue Wildebeest running, Grumeti, Tanzania

Migrating Blue Wildebeest running to catch up the herd,Grumeti,Tanzania

Blue Wildebeest running, Grumeti, Tanzania

Migrating Blue Wildebeest running, Grumeti, Tanzania

Migrating Blue Wildebeest running , Grumeti, Tanzania

Close-up view of a large herd of blue wildebeest (Connochaetes taurinus) crossing the Mara River in dust clouds, Serengeti National Park, Tanzania, Africa

Slow pan view of a large herd of blue wildebeest (Connochaetes taurinus) rushing across a stream in dust clouds, Serengeti National Park, Tanzania, Africa

Close-up view of a herd of blue wildebeest (Connochaetes taurinus) crossing the Mara River in large numbers, Serengeti National Park, Tanzania, Africa