Which of these is the odd one out-Hoolock Gibbon Barbary Ape Orangutan Chimpanzee Gorilla?

Here's why:

* Hoolock Gibbons are smaller apes that are primarily known for their brachiation, swinging through trees using their arms.

* Barbary Apes, Orangutans, Chimpanzees, and Gorillas are all larger apes and share a closer evolutionary relationship.

While all of the listed animals are primates, the Hoolock Gibbon is more distinct due to its smaller size and specialized mode of locomotion.