text: what kind of sound does an orangutan make? have any of you heard it before? is it more like the sound of a gorilla or macaque? i'm curious. thanks! according to animal diversity web, orangutans have a vocal repertoire of about 13 sounds, including lip smacking, screaming, roaring, and grinding their teeth. males also emit loud groans, which can be heard by a human up to 1 kilometer away.  there's a sound clip of these groans here http://www.rollinghillswildlife.com/sounds/orang_longcall.mp3