Check out ten fab facts about these magnificent cats! 1. Jaguars are the largest of South Americaâs big cats and the third largest cats in the world. 2. At one time jaguars roamed all the way to the US-Mexico border, but jaguars are now only occasionally sighted in Texas and Arizona.Most jaguars are found in the Amazon river basin.3.heck out ten fab facts about these magnificent cats! 1. Jaguars are the largest of South Americaâs big cats and the third largest cats in the world. 2. At one time jaguars roamed all the way to the US-Mexico border, but jaguars are now only occasionally sighted in Texas and Arizona.