Following the video yesterday, here are some shots from this morning of Annie walking bipedally. She does this a lot on Young’s Hill. It’s obviously not the primary way of locomotion for chimpanzees, although we do see it here and there. There are a bunch of theories about why bipedal locomotion evolved – maybe based on the need to look over the tall grasses as our ancestors became less arboreal, maybe the need to carry food or babies, or, the new theory JB shared with me this morning as we were watching the chimps forage on the hill – the “this just feels icky on my hands” theory. I’ll have to look that one up, but I think it might be the one that fits Annie best?!