Damaged Chipmunk

This morning, on the way out of the house I noticed something moving in my front beds. I bent over to look and saw a chipmunk. It moved pretty quickly away from my gaze to hide itself and I noticed something odd about it: it's back legs and tails were black, and the legs did not seem to be moving.

I changed my vantage point to look at the poor beast and noticed that indeed its legs were black and dirty (hopefully, rather than entirely infected and gangrenous) and that the animal was paralyzed from the waist down. The chipmunk must have been hit by a car, maybe one of ours, I do not know, and was hiding out in our beds. It was sort of gross and sad, all at the same time.