Final answer:
Pongids, such as gorillas and orangutans, are capable of bipedal locomotion, but they do so inefficiently and only for short periods of time by holding on to branches with their arms for support.
Step-by-step explanation:
Bipedalism is the ability to walk on two legs. Primates, including pongids (great apes), have the ability for bipedal locomotion, but they are not habitually bipedal. Pongids, such as gorillas and orangutans, primarily use quadrupedal locomotion, which means they walk on all fours. However, they are capable of bipedal locomotion, but they do so inefficiently and only for short periods of time. They can walk bipedally by holding on to branches with their arms for support.