Biloela Wild Cockatoos series by Leila Jeffreys. Gang-Gang Cockatoos live in small flocks in the south east of Australia. They set up supervised crèches for their young so parents can take turns feeding away from the nest site. Juvenile male Red-tailed Black Cockatoos resemble females until puberty, which occurs at around four years of age, but have paler yellow barred underparts. As the birds reach maturity, males gradually replace their yellow tail feathers with red ones.