The hippo's 'wheeze honk' is one of the most distinctive sounds in the animal kingdom, and now a new study has revealed that the creatures can recognise their friends' individual honks. Researchers led from the Jean Monnet University studied the behaviour of groups of hippos living in a nature reserve in .Their findings suggest that the animals' calls — which can be heard over great distances — help to maintain social groups, with strangers' honks responded to more aggressively.
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