Australia’s crafty, sulphur-crested cockatoos (Cacatua galerita) appear to have entered an “innovation arms race” with humans, scientists say, as the two species spar over the rubbish in roadside bins.

Humans And Cockatoos Are Embroiled in an Escalating Arms Race in Australia

​The white birds, which can grow nearly as long as a human arm, initially surprised researchers by devising an ingenious technique to prise open household bin lids in Sydney and other areas. Now, a new study says they have gone a step further by thwarting the escalating defenses of fed-up humans. The birds’ and humans’ behaviour may reveal a hitherto unexplored “interspecies innovation arms race”, said a study published Monday in Current Biology. ​Nestled between a forest and a surf-swept beach and bordered by cliffs, the picturesque town of Stanwell Park near Sydney is on the front line of the battle of the bins. “If we don’t close the bin right after throwing out the rubbish they’ll be in there,” said Ana Culic, 21, manager of the town’s Loaf Cafe. “Cockatoos everywhere. Like, just rubbish all over the front area.” Her own family had tried scaring cockatoos away with owl statues to no avail. Arms Race’ in Australia, Then they tried placing bricks on the bin lids, but the cockatoos learned to remove them. Finally, they drilled a lock into the bin. They’re evolving. Yeah, like if you go back like five-ten years ago, they didn’t know how to open bins so they’re figuring stuff out,” said the cafe’s chef, 42-year-old Matt Hoddo. Nearby, 40-year-old resident Skie Jones said he had resorted to an elastic cord to hold down the lid of his household bin after the birds worked out how to remove a brick and then a larger rock.

​”I have got a feeling I am going to be going for an actual lock,” he said. “That’s only a matter of time.” ​Frequent sightings reveal that a single cockatoo can open a bin by holding the lid aloft with its beak while standing near the front edge. Then, with the bin lid still in its beak, it shuffles backward toward the hinge, forcing the lid ever higher until it flips open. Arms Race’ in Australia, The scientists found in an earlier study that knowledge of this technique spread as other birds looked on, creating local “traditions”. Their new research shows that humans, frustrated at having their garbage spread across the street, learned to adapt. But then so did the cockatoos. “When we first started looking at this behavior, we were already amazed because actually the cockatoos learned how to open the bins,” said the study’s lead author Barbara Klump, a behavioral scientist at the Max Plank Institute in Germany. As humans responded, though, “I was really astonished by how many different methods people have invented,” she said. As the cockatoos learned to defeat some of the humans’ protections, the two species appeared to be engaged in a “stepwise progression and reiteration”, said the postdoctoral research fellow. “That was the most interesting part for me.” In a census of 3,283 bins, the latest study found that some cockatoos could defeat low-level protections such as rubber snakes, which could be ignored, or bricks, which could be pushed off.So far, though, the cockatoos had not managed to overcome stronger methods such as a weight actually attached to the lid or an object stuck into the hinge to prevent the bin fully opening. “Bricks seemed to work for a while but cockies got too clever,” one resident told the researchers in an online survey that attracted more than 1,000 participants.

Source: This news is originally published by sciencealert

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