There is a world somewhere between reality and fiction. Although ignored by many, it is very real and so are those living in it. This forum is about the natural world. Here, wild animals will be heard and respected. The forum offers a glimpse into an unknown world as well as a room with a view on the present and the future. Anyone able to speak on behalf of those living in the emerald forest and the deep blue sea is invited to join.
So in conclusion, the American Lion retained the extreme cursoriality as Fossilis but lost some of the bone robusticity (in leg bones)?
What can be said, though, is the loss of bone thickness isn't as significant. The American Lion still has a stronger humerus than a modern lion when considering size parity, and the former has longer, more cursorial bones than the latter.