![]() ![]() ![]() They have other shorter calls for communication, she adds. She says this behaviour evolved as a way of terrifying away would-be predators, even though there are few of those left around these days. It was frightening," Professor Kaplan says. "The worst I ever heard was a flock of 150 that sounded like a freight train. If there's one thing sulphur-crested cockatoos are known for, it's their loud, raucous screeching as they zoom overhead: it can be quite deafening when they're in big numbers. Professor Kaplan says some of the damage caused by cockatoos may be a result of humans having gotten rid of so much of the birds' natural habitat. He says keeping them away involves a bit of persistence - you can try spraying them with water, putting a taut wire above railings, or using bird-safe netting to exclude them from areas. "It could just be they've got a bad attitude," says Dr Martin, adding it might be boredom or playfulness, and it might only be some individuals that are guilty of this behaviour. They might be sharpening their beak - but that seems like a lot of sharpening! Without being inside the mind of a sulphur-crested cockatoo, it's not clear why they do this sort of thing. ![]()
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