Talk:Sea Treader Leviathan/@comment-136.53.80.237-20191129013545/@comment-26563820-20200110222034

Bipedal = (of an animal) using only two legs for walking.

biped- (from bi-‘having two’ + pes, ped-‘foot’) + -al.

A bipedal animal needs to have two legs. I think these creatures are considered bipedal because their front "leg" is actually their mouth, so only have two actual legs.