In one study, researchers at the University of Stirling and at Blair Drummond Safari Park in Britain watched how three chimpanzees reacted as a fourth chimp, an elderly female named Pansy, sickened and died.
Park officials had separated Pansy from the other chimpanzees for treatment when she became ill in November 2008. But when her breathing became irregular a few weeks later, the other three chimps were allowed to join her.
In the 10 minutes before she died, the three animals – an elderly female named Blossom, Blossom’s adult son Chippy and Pansy’s adult daughter Rosie – frequently groomed (梳理毛发) and touched Pansy. They stood in close, and Chippy shook her arm, apparently testing for signs of life. When they got no reaction, “they appeared to arrive at a decision that something had changed, and she was no longer the same as she was beforehand,” said lead researcher James Anderson, from the University of Stirling. “It seems they are clearly able to distinguish the difference between being alive and unresponsive .”
Soon, both Blossom and Chippy left Pansy’s side. Even though it was not her usual sleeping area, Rosie stayed and slept by her mother’s body almost the entire night.
Sixteen hours after Pansy’s death, zookeepers removed the body, with the three chimps watching quietly. For several days afterward, the group refused to make a nest at the area where Pansy had died.
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