Which type of locomotion is characterized by a back-and-forth swinging motion using arms?

The locomotion characterized by a back-and-forth swinging motion using arms is brachiating. This form of movement is predominantly seen in some primates that use their long arms to swing from branch to branch in trees. Brachiators, such as gibbons, exhibit this style of locomotion, which allows them to move efficiently through their arboreal habitat.

In brachiation, the emphasis is on the arms as the primary means of support and movement, contrasting with other locomotion types where the legs play a more significant role. This motion enables brachiators to cover large distances in the trees while minimizing energy expenditure, as the swinging motion helps them maintain momentum.

Understanding brachiation provides insight into the evolution of primate locomotion and the adaptations that have occurred in different species over time, particularly as they relate to habitat and survival strategies in arboreal environments.