Dr Catherine Hobaiter, who led the research, said that this was the only form of intentional communication to be recorded in the animal kingdom.

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。

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Language is the most astonishing behavior in the animal kingdom.

语言是动物界中最令人惊讶的行为。

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Now, for animals other than birds, the care of young by both parents is pretty unusual in the animal kingdom.

现在，对于鸟类以外的动物来说，父母双方都照顾孩子在动物界是很罕见的。

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For example, altruistic behaviour towards relatives, infidelity, rape and murder are all widespread in the animal kingdom.

ECONOMIST: The proper study of mankind

He thinks their conditions are treatable and that, as our closest relatives in the animal kingdom, they deserve proper psychiatric care.

BBC: Lab chimps successfully treated with anti-depressants

Larger beasts may have slower metabolisms in the animal kingdom, but the opposite occurs in cities, which get faster as they grow.

WSJ: To Build Creative Cities, the Sky Has Its Limit by Richard Florida