It has been discovered that orangutans “blow kisses”, which make their voices become deeper, to suggest that they are larger than they actually are. They give a signal called a “kiss-squeak” when hey feel threatened, scientists have found.
Madeleine Hardus, a behavioural biologist of Utrecht University, believes the deeper sound is to deceive predators.
Miss Hardus said: “To our knowledge this is the first evidence of how and why non-human primates affect their own calls through the use of hand and tools.
“Because dishonestly signalling larger body size might yield the greatest advantage in highly dangerous situations, we expect that the use of kiss squeaks on leaves would increase in such conditions.”
So, next time you go to the zoo and notice an orangutan blowing you kisses, it may not be for the reason you had previously though.
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