Ultimate causes could be to alert the other chimps, and Proximate could be they learned from imitation... but I'm not sure.. More ideas?|||It's known that loud noises sometimes scares predators away. Humans have waved their arms and screamed as loud as they could to deter lions, leopard, etc. With leopards it doesn't always work since they hunt babboons and chimpz which are quite vocal primates.
Ultimately, yes, it's a warning signal to others, but also a deterrant.
Obviously imitation is also a factor to consider, it's basically part of their 'language'.
Fear shouldn't be ruled out, it's something most primates do when they are threatened, even some antelope utters cries of fear.
I hope this helps.
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