Recordings of the low grunts of a vervet who spotted an eagle led other vervets to look up into the sky; recordings of the high-pitched chutters emitted by a vervet upon noticing a python caused them to scan the ground.

只尾黑颚猴只老鹰时出低沉的咕哝，记录其他尾黑颚猴抬头仰望天空的。尾黑颚猴在注意到蟒蛇时出高调的叫，记录了它们扫描地面的情况。