Missouri has had two Mountain Lions found as road kill. Both by DNA were wild animals and not escaped/released pets. A couple of more have been video taped by crediable sources, once by a Conservation Agent. This cat was on a deer kill a mile as the crow flys from my deer hunting area in the National Forest. Several more have been photographed, a couple have been treed by hounds and pictures taken while the critter was in the tree. I saw a few pictures of one of these. A couple of guys were rabbit hunting and their beagles jumped the cat and it took treed nearly immediately. It went up in a little Osage Orange tree that was barely big enough to get it eight feet off the ground. The guys were lucky enough to get a couple of pictures and the cat got nervous and bailed out on them. Pretty incrediable stuff! A taxidermist had a fellow bring one in for mounting. He claimed it was killed "out west" and said he'd lost his tag. The taxidermist called the Conservation Agent who then investigated and eventually the guy admitted to killing it here in Missouri. I think this is the kind of evidence that leaves conclusive and absolute proof of an actual population of animals.
And yes, bobcats and coyotes, even bears do get occasionally killed by vehicles on the roadways. I know of two bobcats killed by vehicles here in this county last year. I see coyotes dead roadside often enough to not be unusually surprised. Obviously, the numbers aren't as high as deer, so there would be far less roadkill of the predators, ratio per population as compared to the more numerous whitetails. And perhaps they are more wary of the roadway than deer. I'm thinking of turkeys right now, we have as many turkeys as deer here in Missouri, yet that is a species that doesn't seem to get killed in the roadway too often. It happens on rare occasion, but not nearly as much as with whitetails. Of course, turkeys are roosted at night and not on the roadways, so maybe that has a large part to play. Even so, they are seldom hit during the daylight hours when they are active.
A couple of other comments related to the above. Many states have what is called a "permissive" wildlife code. In other words, they permit you to hunt certain animals and during the set aside season. Killing anything that isn't mentioned in the code book is illegal. It isn't permitted to kill something just because it isn't mentioned in the book. Food for thought, you may want to check your state wildlife regs before jerking the trigger on something you're unsure of.
And last, to the best of my knowledge, there has never been a documented "black" Mountain Lion. Panthers (leopards/jaguars) are a different animal and not native to the US, being found in Africa and Asia. The exception being the Jaguar of the Central America's, which does occasionally roam into the extreme southern U.S. Black Panther stories float around, yet, in all the good wide open western states since recorded time, and, all of American history of the east, has there ever been an actual black Mountain Lion documented. Not in all of our history. If there was such a critter ever, you'd think that when the populations were high and they were being hunted to the point of extermination in the eastern U.S. and hunted extensively in the western states, that at least ONE would have been found. Mountain Lions are still hunted in the western states and much, much, research in modern times has been devoted the big cat, and yet, there still are no black melanistic phase animals showing up. Food for thought... /ubbthreads/images/graemlins/confused1.gif