* Hoots: Similar to an owl's call, often used as a greeting or to signal alarm.
* Screeches: High-pitched, piercing sounds used for alarm or excitement.
* Barks: Short, sharp sounds used for territorial defense or warning.
* Grunts: Low, guttural sounds used for communication or to express dominance.
* Pant-hoots: A combination of hoots and panting sounds, often used as a display of dominance.
* Whistles: High-pitched whistles used for communication over long distances.
* Roar: A deep, booming sound made by some apes, like gorillas, to intimidate rivals.
The specific sounds that apes make vary depending on the species, age, and context.
For example, chimpanzees are known for their loud, complex calls, while gorillas are known for their deep roars.
It's also important to note that apes use facial expressions, body language, and gestures to communicate, in addition to vocalizations.