领导这项研究的凯瑟琳·霍拜特博士说，这是动物王国中唯一被记录的有意图的交流方式。
Dr Catherine Hobaiter, who led the research, said that this was the only form of intentional communication to be recorded in the animal kingdom.
宾夕法尼亚州匹兹堡卡内基·梅隆大学海兹学院的Alessandro Acquisti领导这项研究。
Alessandro Acquisti at Carnegie Mellon University's Heinz College in Pittsburgh, Pennsylvania, led the study.
领导这项研究的蒙丽莎•里伯途斯说：“先前针对年纪更大的孩子做的研究让人们认为数学训练更有可能决定数字感。”
Dr Melissa Libertus, who led the study, said: "Previous studies testing older children left open the possibility that maths lessons determined number sense."
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