Please read these three papers
Brunet et al 2002 - A new hominid from the Upper Miocene of Chad, Central Africa
Pickford et al - Bipedalism in Orrorin tugenensis revealed by its femora (n.b: feel free to skip the French translation)
More info:
If you want more info, this piece on the Orroin femur could help
And here is a fascinating discussion of the femur of Sahelanthropus
Pick one aspect of the skeletal evidence of bipedalism and write a short blog post about it. If you need more background check out the chapter on early hominins from Monday or do a web search.
Look at the articles over the past 2 days and notice what they are talking about in terms of functional aspects of bipdealism. For example, what about the femur of Orroin suggests it is a biped. If you need help this site is full of awesome info. Or you could decide to look at what make the foramen magnum relevant for bipedalism. If you need help, send me a message on Slack!