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In the experiment, two keas were separated on either side of a chicken wire fence. The birds had to tug on a string in unison to drag a board with food towards them. If only one string was pulled, the food would move out of reach. To get the food, they had to pull the string together. The results showed the kea were willing to wait up to a minute for the other bird to arrive before pulling the string, even distracting themselves while waiting. "This is the first demonstration that any non-human animal can wait for over a minute for a cooperative partner, and the first conclusive evidence that any bird species can successfully track when a cooperative partner is required and when not," the researchers found. A study published last week from the same research showed kea did not mind if they were given unequal rewards. Unlike many mammals, such as humans and chimpanzees, they did not appear to have an innate sense of fairness and were willing to work together even if their partner got a better reward than they did. Researchers say a better understanding of kea can help with their conservation. Kea are undergoing a sharp population decline, due largely to human encroachment into their habitat.