Franco Banfi / California sea lion (Zalophus californianus), Los Islotes, Sea of Cortez, Baja California peninsula, Mexico, East Pacific Ocean.

Pascal Kobeh / Group of California sea lions (Zalophus californianus) in a kelp forest (Macrocystis pyrifera), California, USA. Pacific ocean.

Pascal Kobeh / Group of California sea lions (Zalophus californianus) swimming in kelp forest (Macrocystis pyrifera), California, USA. Pacific ocean.

Claudio Contreras / Californian sea lion (Zalophus californianus), Espiritu Santo Island National Park, Sea of Cortez (Gulf of California), Mexico, April

Mark Carwardine / California sealions (Zalophus californianus), one in water with other sitting on rock, Baja California, Sea of Cortez (Gulf of California), Mexico

Suzi Eszterhas / California Sea Lion (Zalophus californianus) mother and pup, Monterey Bay, California, USA, April

Alex Mustard / A young California sealion (Zalophus californianus) swims in a shallow pool. Los Isotes, La Paz, Mexico. Sea of Cortez, East Pacific Ocean.

Alex Mustard / A split level view of a bull California sealion (Zalophus californianus) swimming beneath Los Islotes sealion colony. La Paz, Mexico. Sea of Cortez, East Pacific Ocean.

Alex Mustard / A young California sealion (Zalophus californianus) portrait, inside an underwater cave. Los Isotes, La Paz, Mexico. Sea of Cortez, East Pacific Ocean.

Alex Mustard / A young California sealion (Zalophus californianus) playing with a starfish, inside an underwater cave. The pups will pick up a variety of objects (such as starfish, lumps of coral, shells and feather...

Alex Mustard / A young California sealion (Zalophus californianus) playing with a starfish, inside an underwater cave. The pups will pick up a variety of objects (such as starfish, lumps of coral, shells and feather...

Alex Mustard / A bull California sealion (Zalophus californianus) bursting through a school of baitfish in the shallows. Los Isotes, La Paz, Mexico. Sea of Cortez, East Pacific Ocean.