Even when residents in these areas weigh down the tops of their bins with bricks or stones, cockatoos have figured out how to knock these heavy objects to the ground. Once that barrier is removed, the hungry birds can crack the lid open with their beak, prop it on their heads and walk it back until it fully flips on its hinges, as the videos show below. This unique skill has now become so widespread in Sydney, researchers think the parrots are imitating and learning from one another – a sign of cultural evolution.

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