Bob, Mountain lions, cougars & panthers (in the USA) are all different names for the same critter. They run 100-150 lbs. around here. Panthers in other countries are a different species. Jaguars are rare here but a few have wandered up from Mexico, they're colored different (spotted) & bigger. Bobcats are of course smaller & have short tails. There is a 40+ lb. bobcat that hangs around here along w/ her now grown cub. None of the wildcats here show even the slightest fear of men & total disdain for dogs (unless there's a pack of trained hounds). They (along w/ whitetails, mule deer & javelina) come in to our pond or water though every few nights. The wild cats help keep the varmints under control.