
A handout photo supplied by the Taronga Zoo and released 31 March 2010, of three week old Asian Elephant calf Pathi Harn (left) playing in the mud at Taronga Zoo, Sydney, 22 March 2010. Pathi Harn has gained around a kilogram a day since emerging from a traumatic birth, and now weighs around 138kg. Both calves are part of the zoo's conservation breeding program for Asian Elephants which are endangered in the wild. EPA/TARONGA ZOO / HO

A handout photo supplied by the Taronga Zoo and released 31 March 2010, of three week old Asian Elephant calf Pathi Harn (left) playing in the mud wallow with his older cousin, eight month old Luk Chai at Taronga Zoo, Sydney, 22 March 2010. Pathi Harn has gained around a kilogram a day since emerging from a traumatic birth, and now weighs around 138kg. Both calves are part of the zoo's conservation breeding program for Asian Elephants which are endangered in the wild. EPA/TARONGA ZOO / HO

A handout photo supplied by the Taronga Zoo and released 31 March 2010, of three week old Asian Elephant calf Pathi Harn (left) playing in the mud wallow with his older cousin, eight month old Luk Chai at Taronga Zoo, Sydney, 22 March 2010. Pathi Harn has gained around a kilogram a day since emerging from a traumatic birth, and now weighs around 138kg. Both calves are part of the zoo's conservation breeding program for Asian Elephants which are endangered in the wild. EPA/TARONGA ZOO / HO

A handout photo supplied by the Taronga Zoo and released 31 March 2010, of three week old Asian Elephant calf Pathi Harn (left) playing in the mud wallow with his older cousin, eight month old Luk Chai at Taronga Zoo, Sydney, 22 March 2010. Pathi Harn has gained around a kilogram a day since emerging from a traumatic birth, and now weighs around 138kg. Both calves are part of the zoo's conservation breeding program for Asian Elephants which are endangered in the wild. EPA/TARONGA ZOO / HO
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