One of the comments reads : Actually, we will probably never figure out, was it man or woman. but I thought this comment of the professor was an interesting eye opener. https://mastodonapp.uk/@MarkHoltom/112070436760917344
Likely durability. A bone and a stick can both be thrown into a bag and carried with you, but a bone is much more durable than a stick. It’ll be less likely to break or wear down as it rubs against everything else in your bag.