Liger

  The liger is a cross between a male lion and a tigress. It is different from the similar hybrid tiglon. The liger is the largest of all known felines. Ligers enjoy swimming, a charecteristic of tigers and, much like the lion are very social. Ligers exist only in captivity because the habitat of the parental species don't overlap.
  Ligers are the largest cat in the world due to imprinted genes. It is erroneously believed that ligers continue to grow throughout their lives because of hormonal issues. Female ligers may also attain massive sizes, weighing around 320 kilograms or 705 pounds and reaching 3.05 meters or 10 feet. On a somewhat unrelated note, pumapards, a cross between a puma and leopards tend to show dwarfism. Ligers are the same size as the extinct American lion.