They hear sounds in the same way that humans do.
it sounds like a monkey
monkey
ape
dog, dolphin, bird, whale, monkey
oo oo oo oo oo oo
it kind of sounds like a deranged fire alarm
sounds like your a monkey
I've heard that bat feces is called guano-which sounds similar but is very different. I don't know what monkey feces is called.
first, eat some bananas then spin around in a circle three times then scratch your armpits are make monkey sounds then you will have made some friends!
A Barred owl may sound like a monkey.
Try looking st this link if it helps...http://www.orangeyeti.com/the-white-monkey/ sounds like it could be a really positive symbol to be in your dream!