I will atest to the validity of timber rattlers in NE Kansas, from Maries De Cyne all the way to White Cloud. When I was a kid, an old river rat I knew caught and pickled timber rattlers and copperheads, all the way up the eastern half of Kansas, sold them to schools and tourists. I have seen him with some monsters. As far as Mountain Lions, 4 years ago, one got hit by a car and killed, on the entrance to the paseo bridge, in North Kansas City. One was also killed about the same time on I-70 east of Columbia, and one killed in west Omaha, Ne. also. All conservation agencies denied the possibility that the cats were wild, assuming they were released pets, but DNA proved otherwise! The sharp teeth, sharpened claws, bits of deer and rabbit in the gut was enough for me! Now presumed to be young males pioneering new territory. 10 years ago, we had free range reproducing elk in the Blue river drainage, between KC and Independence, ear tag proved they were tagged in Montana. now residents of the local Old Missouri Town nature compound. Amazing how resilient nature and wildlife is! P.S. Missouri now stocking Elk in the Ozarks, Wonder if they have any idea how far they travel and how minimal effect a barbed wire fence has? They like corn and alfalfa fields too!