19. Mountain Lions
This North American cat can also be known as a cougar, puma, and panther. What makes these big cats difficult to hunt is that they’re known to stalk hunters in order to observe their behavior; these cats are highly intelligent.
The majority of the time, mountain lions mean no harm to humans; their main prey are deer and other herbivores. The few times that a mountain lion attacks a human, they do so by surprise-attacking from a high vantage point.
Adult males can weigh between 115-220 pounds and become almost 8 feet long.