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Scientists at the University of St Andrews studied the copulation calls -- sounds they sometimes make during mating -- of female chimpanzees in Uganda to find out more about what they mean.
The Scottish institution's team concluded that female chimps sometimes keep quiet during sex so their female rivals do not find out what they have been up to.
The team established that female chimpanzees hid their sexual activity when high-ranking females were nearby, perhaps in a bid to reduce competition for good quality males.