The second polar bear born in Australia has arrived at a Gold Coast theme park.

Sea World's polar bear Liya has given birth to a cub believed to weigh about 600 grams and is 15 centimetres long.

She had given birth to two cubs on May 9, but one died shortly after being born.

Polar bear experts from around the world and a veterinary team are monitoring Liya and the cub closely.

Sea World marine sciences director Trevor Long says Liya has been maternal towards the cub.

He says there are high mortality rates among newborn polar bears but the signs are so far all positive.

The cub appears well and has been observed suckling milk.

"This is a very exciting time for Sea World and all of the staff involved and we remain cautiously optimistic in these very early days," Mr Long said in a media release on Monday.

There are about 20,000 to 25,000 polar bears living in the wild in the world.

 

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