眼镜猴后肢很长，踝骨细长，因此又名跗猴。

After dark, it can jump more than 40 times its own body length in a surprising display of agility.

天黑后，它们跳跃高度可达体长的40倍以上，弹跳力惊人。

The casual mammal is often seen in inquisitive mode, caught with one eye closed as if in cahoots with the photographer.

眼镜猴常常表现出好奇的样子，闭上一只眼睛好像在跟摄影师串通好了一样。

While they are famous for not saying much at all, research several years ago found that they are real chatterbox' – in ultrasound.

它们也以“寡言少语”著称，不过几年前的一项调查却发现它们实际上是“话匣子”，只不过是用超声波交流而已。

Researchers from Humboldt State University in California in fact found that the 'minimum frequency' of its call is 67 kHz - higher than any land-based animal bar rodents and some bats – and occasionally rising to 70 kHz.

加利福尼亚洪堡州立大学的研究人员发现，它们叫声的最低频率是67千赫，有时甚至能达到70千赫，高于除啮齿动物和蝙蝠外的任何陆地生物。

Anything above 20 kHz is inaudible to a human, with dogs able to detect sounds pitched up to 23 kHz.

人类听不到20千赫以上的声音，而狗可以察觉到高达23千赫的声音。

This means that the creatures effectively have a secret language that they can use to warn each other of predators.

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