Twenty individuals released in the wild at Narawntapu National Park in Northern Tasmania.
Conservationists hope the success of a partnership between a university and a wildlife sanctuary can save the endangered animal.
When a northern white rhino died in the Czech Republic recently, it left four remaining -- on the entire planet! Julia explains the science behind how animals are deemed to be extinct or endangered.
The survival of the species now rests with around 100 rhinos in the wild in Indonesia and nine in captivity.
The critically endangered critters are responding well to the use of long-stored frozen sperm to help with their diversity.
The Albany Pine Bush Preserve in New York holds within it a rare species: the endangered Karner blue butterfly.
Some 440 tigers were recorded during the previous census conducted in 2004 in the World Heritage-listed habitat.
The crushing of ivory tusks is meant to show that the U.S. won't tolerate wildlife crimes.
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