About thirteen endangered Carnaby's black cockatoos were liberated and sent back to the wild following their treatment after they were injured in the Perth hail storm on March 22, where metropolitan dwellers saved almost 24 birds. One of the birds died and others sustained fractures and bruises.

In the hail storm about 70 such birds were affected most of which were found dead and 24 were treated by Department of Environment and Conservation (DEC) and the Perth Zoo.

13 of the treated birds were released by Volunteers and DEC officers in King's park on Wednesday, while the remaining birds are undertaking treatment at the veterinary hospital of the zoo and Black Cockatoo Recovery Centre in Perth.

Rick Dawson, DEC Senior Investigator, informed that 57 birds died in the storm. It was also said that the released birds will be monitored for their recovery as they have been micro chipped and banded. He elaborated that most the birds just had external wounds and that when they were released in the rehab they could not fly properly. Also it was revealed that most of the birds had broken bones and only one suffered head injury.

Carnaby's black cockatoos have decreased in number from 150,000 in the 1950 to 40,000 presently.