Monkeys string words together
Putty-nosed monkeys in West Africa share the human ability to combine different sounds to mean different things, according to researchers. St Andrews University, UK, scientists found the creatures, in Nigeria’s Gashaka Gumti National Park, used two main call types to warn of predators.
But a particular sequence of calls also appeared to mean something else. The scientists identified two call types - “pyows” and “hacks” - which the monkeys use to alert each other to danger; but found a string of pyows warned of a loitering leopard, while a burst of hacks indicated a hovering eagle.
A sentence made up of several pyows, followed by a few hacks, told the group to move to safer ground.
Dr Kate Arnold, a primate psychologist, discovered the phenomena by playing variations of the calls back to the monkeys to see how they behaved. This showed they could encode fresh information by combining two existing calls, rather than creating a new sound, she said.
“These calls were not produced randomly and a number of distinct patterns emerged,” she said. “The pyow-hack sequence means something like ‘let’s go’, whereas the pyows by themselves have multiple functions and the hacks are generally used as alarm calls.
“This is the first good example of animal calls being combined in meaningful ways.
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