There, zookeepers filmed an adult siamang gibbon while making calls when his throat inflated hard.
Human-like monkeys like chimpanzees, gorillas, orangutans, and gibbons are very reasonable animals. They have big brains, long limbs with long fingers, and their body is covered with hair. In body structure, they are similar to humans. They are also closely related to us.
Gibbons have such long arms that they can even touch the ground with their finger joints when standing. They live in family communities with two to four babies in addition to the male and female. The largest is a siamang, which weighs about 10 kg (22 lb). Due to the weight, the siamang cannot hang on thin branches, which other gibbons may otherwise do.
Years ago, a video shwoing an adult siamanga while making call has landed online - its throat was inflated at the time, and the video has hit almost a million views to date.