facultative biped造句

• It was probably quadrupedal, but may have been a facultative biped.
• As a facultative biped, " Anchisaurus " had to have multi-purpose front legs.
• Hadrosaurids were facultative bipeds, with the young of some species walking mostly on two legs and the adults walking mostly on four.
• In order to be considered a true facultative biped, an animal must be capable of sustained movement over many strides while bipedal simply adopting a static bipedal posture while resting or looking around is not sufficient.
• Some researchers infer from the form of her pelvis and limbs and the presence of her abductable hallux, that " Ardi " was a facultative biped : bipedal when moving on the ground, but quadrupedal when moving about in tree branches . " A . ramidus " had a more primitive walking ability than later hominids, and could not walk or run for long distances.