Zoologist Joyce Poole was the first to notice some rather unelephantine noises emanating from a group of semiwild, orphaned elephants in Tsavo National Park, Kenya.

动物学家乔伊斯·普尔是安博塞利大象研究计划的负责人，也是第一个注意到这种现象的人。

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In December, nine elephants were killed outside the Tsavo National Park, in south-eastern Kenya.

BBC: African elephant poaching threatens wildlife future

After this, they gave semi-wild elephants in a rehabilitation centre in Tsavo National Park four types of branches.

BBC: Ants work with acacia trees to prevent elephant damage

Saturday's killings took place in Tsavo National Park, Kenya's largest single continuous ecosystem, which is home to some 13, 000 elephants.

BBC: Kenya hunts ivory poachers after elephant family killed