Tony Wu / Juvenile Australian sea lion (Neophoca cinerea) silhouetted against blue skies at Carnac Island, Western Australia

Tony Wu / Juvenile Australian sea lion (Neophoca cinerea) resting in shallows, possibly to thermoregulate, Carnac Island, Western Australia.

Merryn Thomas / People walking among Carnac megaliths, Lorient, Brittany, France, June 2015.

Tony Wu / Australian sea lion (Neophoca cinerea) lying in a bed of sea grass, blowing bubbles. Carnac Island, Western Australia.

Tony Wu / Two mature male Australian sea lions (Neophoca cinerea) play fighting. Carnac Island, Western Australia.

Tony Wu / Australian sea lion (Neophoca cinerea) being inquisitive. Carnac Island, Western Australia, Indian Ocean.

Tony Wu / Australian sea lions (Neophoca cinerea) juvenile and mature bull resting after play fighting, Carnac Island, Western Australia.

Tony Wu / Two male Australian sea lions (Neophoca cinerea) play fighting with one another, Carnac Island, Western Australia.

Tony Wu / Australian Sea Lion (Neophoca cinerea) resting in shallow water, Carnac Island, Western Australia.

Tony Wu / Young male Australian sea lion (Neophoca cinerea) resting on the sand in shallow water, Carnac Island, Western Australia.

Tony Wu / Australian sea lion (Neophoca cinerea) male with Striped cowfish (Aracana aurita) Carnac Island, Western Australia.

Tony Wu / Australian sea lion (Neophoca cinerea) playful male, pushing nose against camera, Carnac Island, Western Australia.