You can't win with these guys. Can't listen to reason has no grip on reality. Please Boa please show me a more recent study. The roundup that I am guessing you are opposed to, just happens to be observed by a State of Texas biologists. Sure is a lot of Internet biologists/herpatologists as of late. You can come on a guided hunt and see for yourself, there's no secrets. You can visit the snakes at the roundup...good luck finding a hotel though.
I think by jaguar you would be referring to the mountain lion, cougar, panther and the numerous other names, those are very much alive.