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.

Dave Watts / Two female Australian sea lions (Neophoca cinerea) playing and interacting on a beach, with others nearby, Seal Bay Conservation Area, Kangaroo Island, South Australia.

Dave Watts / Female Australian sea lion (Neophoca cinerea) scratching and rolling on a beach, Seal Bay Conservation Area, Kangaroo Island, South Australia.

Inaki Relanzon / Australian Sea Lion (Neophoca cinerea) sitting on beach with one flipper up, Seal Bay Conservation Park, Kangaroo Island, South Australia State, Australia.

Alex Mustard / A pair of Australian Sea Lions (Neophoca cinerea) socialising in the shallows. Kangaroo Island, South Australia, Australia. Southern Ocean. November

Alex Mustard / An Australian Sea Lion (Neophoca cinerea) bathing in the sun at the surface. Kangaroo Island, South Australia, Australia. Southern Ocean. November

Jurgen Freund / Australian sea lion {Neophoca cinerea} portrait underwater with tourist boat, Fisherman's Island, Batavia Coast, Western Australia 2006

Jurgen Freund / Australian sea lion {Neophoca cinerea} portrait underwater, Fisherman's Island, Batavia Coast, Western Australia

Dave Watts / Australian sealion with young at sea surface {Neophoca cinerea} Australia. Endangered species.

Norbert Wu / Australian Sea Lion (Neophoca cinerea) group swimming over seaweed, South Australia

Mitsuaki Iwago / Australian Sea Lion (Neophoca cinerea) resting with seaweed on its head, Australia

Gary Bell/ Oceanwide / Australian Sea Lion (Neophoca cinerea), Hopkins Island, South Australia, Australia

Gary Bell/ Oceanwide / Australian Sea Lion (Neophoca cinerea), Hopkins Island, South Australia, Australia

Gary Bell/ Oceanwide / Australian Sea Lion (Neophoca cinerea), Hopkins Island, South Australia, Australia

Gary Bell/ Oceanwide / Australian Sea Lion (Neophoca cinerea) group, Hopkins Island, South Australia, Australia

Gary Bell/ Oceanwide / Australian Sea Lion (Neophoca cinerea) group, Hopkins Island, South Australia, Australia

Hiroya Minakuchi / Australian Sea Lion (Neophoca cinerea) underwater portrait, South Australia

Gerry Ellis / Australian Sea Lion (Neophoca cinerea), Kangaroo Island, Australia

Gerry Ellis / Australian Sea Lion (Neophoca cinerea) female coming ashore, Kangaroo Island, Australia

Norbert Wu / Australian Sea Lion (Neophoca cinerea) group, a favorite prey of Great White Sharks, South Australia

Mitsuaki Iwago / Australian Sea Lion (Neophoca cinerea) scratching itself, Kangaroo Island, Australia

Mitsuaki Iwago / Australian Sea Lion (Neophoca cinerea) male approaching a female to mate, Australia

Mitsuaki Iwago / Australian Sea Lion (Neophoca cinerea) pups on sandy beach, Australia

Doug Gimesy / Australian sea lion (Neophoca cinerea) basking in the sun.? Sandy Bay, Kangaroo Island, South Australia, Australia.?

Doug Gimesy / Australian sea lion (Neophoca cinerea) basking in the sun.? Sandy Bay, Kangaroo Island, South Australia, Australia.?

Doug Gimesy / Australian sea lion (Neophoca cinerea) chasing off seagulls, ?Sandy Bay, Kangaroo Island, South Australia, Australia

Doug Gimesy / Faecal sample from Australia Sea Lions (Neophoca cinerea) that has been plated on Chromacult media - a selective differential media that makes E. coli visible by showing it as dark purple.?Macquarie U...

Suzi Eszterhas / Australian sealion (Neophoca cinerea), two males sparring on beach. Kangaroo Island, South Australia. November.

Suzi Eszterhas / Australian sea lion (Neophoca cinerea) swimming, head above water. Kangaroo Island, South Australia. November.

Suzi Eszterhas / Australian sealion (Neophoca cinerea) pup suckling. Kangaroo Island, South Australia. November.

Suzi Eszterhas / Australian sea lion (Neophoca cinerea) pup suckling. Kangaroo Island, South Australia. November.

Suzi Eszterhas / Australian sea lion (Neophoca cinerea) female suckling pup on beach. Kangaroo Island, South Australia. November.

Suzi Eszterhas / Australian sealion (Neophoca cinerea) female suckling pup on beach. Kangaroo Island, South Australia. November.

Suzi Eszterhas / Australian sealion (Neophoca cinerea) pair interacting on beach. Kangaroo Island, South Australia. October.

Suzi Eszterhas / Australian sealion (Neophoca cinerea) female suckling pup on beach. Kangaroo Island, South Australia. October.

Suzi Eszterhas / Australian sealion (Neophoca cinerea) female and pup on beach. Kangaroo Island, South Australia. October.

Steven David Miller / Australian sea lion (Neophoca cinerea) male basking on beach with Great crested terns (Thalasseus bergii) in foreground. Seal Bay Conservation Park, Kangaroo Island, South Australia.

Steven David Miller / Australian sea lion (Neophoca cinerea) female crawling through bed of seaweed on beach. Seal Bay Conservation Park, Kangaroo Island, South Australia.

Steven David Miller / Australian sea lion (Neophoca cinerea) male basking whilst sitting in bed of seaweed. Seal Bay Conservation Park, Kangaroo Island, South Australia.

Steven David Miller / Australian sea lion (Neophoca cinerea), two females interacting on beach having emerged from sea. Seal Bay Conservation Park, Kangaroo Island, South Australia.

Steven David Miller / Australian sea lion (Neophoca cinerea) male basking on seaweed on beach. Seal Bay Conservation Park, Kangaroo Island, South Australia.

Steven David Miller / Australian sea lion (Neophoca cinerea), two females greeting each other on beach. Seal Bay Conservation Park, Kangaroo Island, South Australia.

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.