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In one study released last month, eastern and western chimpanzees — which are two different subspecies — were observed in the wild to have distinct drumming patterns.

All this suggests that the last common ancestor of chimpanzees, bonobos and humans likely also produced compositional structures.

The scientists also compiled decades of scientific observations to create a catalogue of the different ways in which chimpanzees use "forest first aid".

For decades, scientists could be laughed at for suggesting that dogs “smile” at their owner or chimpanzees “kiss” after a conflict to make up.

Researchers at Durham University found that chimpanzees were as likely to console one another as bonobos - even though the latter is typically considered the more "empathic" primate.