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2 . A new study on 26 chimpanzees (黑猩猩) from zoos around the world found that chimpanzees can recognise family members and long lost friends even after decades of separation.
The participating chimpanzees were given juice while staring at a screen flashing side by side photos of other chimps. One animal from each pair of photos had lived with the group for at least a year, while the other was a stranger. An eye-tracking camera recorded where the participants were looking and for how long. Data showed their eyes rested longer on familiar groupmates, suggesting “rich recognition of each other.”
There is also evidence that they became more intent when shown a picture of a chimpanzee with whom they’d had more positive interactions, compared with conflicting relationships.
In the most impressive case, a 46-year-old chimpanzee named Louise repeatedly demonstrated “intense” attention upon seeing photographs of her sister Loretta and nephew Erin, whom she hadn’t seen in more than 26 years. The team said Louise’s results represent the longest-lasting social memory documented in any non-human animal to date.
“We tend to see ourselves as unique special creatures with incredible intellectual (智力的) capacities that are very different from other animals on earth,” said Laura Simone Lewis, a postdoctoral fellow in Berkeley’s psychology department and lead author of the study. “This study is showing us how similar we are to chimpanzees.” She noted that the findings support the theory that long-term social memory in humans and modern day chimps has come from “our last common ancestor that lived somewhere between 5 to 7 million years ago” who also likely had long-term social memory.
Now that they have definitive evidence that these endangered species possess long-term social memories, researchers have more questions, including whether chimpanzees miss the individuals they’re no longer with, especially their friends and family. “Our study doesn’t determine they are doing this, but it raises questions about the possibility that they may have the ability to do so,” Lewis said.
1. What is paragraph 2 mainly about?A.The nature of chimps. | B.The method of the study. |
C.The analysis of the recorded data. | D.The layout of experimental equipment. |
A.Attentive. | B.Doubtful. | C.Hesitant. | D.Emotional. |
A.To stress chimps are as intelligent as human beings. |
B.To explain where chimps’ social memory comes from. |
C.To better demonstrate the chimps’ memory length. |
D.To further prove the existence of chimps’ social memory. |
A.Whether chimps feel strong emotions to their long lost friends. |
B.How to strengthen chimps’ long-term social memories. |
C.How chimps recognised their close contacts after long separation. |
D.Why chimps possess the amazing social memories. |
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