Cougar kill by breaking the neck usually from over the top. Often not a lot of sigh on the neck unless you skin it out. Their first meal is to open the belly and eat the liver....just like this one! Be careful!! They usually will cover their kill somewhat and return later unless they are surprised or scared off early, which is what I would suspect here. I will guarantee this cat is not far away and if hungry they will defend a kill. As I say, I would have chills up the back of my neck and be very careful.