The term 'Big Cats' refers to the four species of large, predatory cats: tigers, LIONS, pumas, and leopards. Tigers are the largest of the big cats, with males weighing up to 660 pounds and measuring up to 11 feet in length. LIONS are the second largest of the big cats, with males weighing up to 550 pounds and measuring up to 10 feet in length. Pumas, also known as cougars or mountain LIONS, are the third largest of the big cats, with males weighing up to 220 pounds and measuring up to 8 feet in length. Leopards are the smallest of the big cats, with males weighing up to 200 pounds and measuring up to 7 feet in length.