Liger is the largest of all known cat species and represents a hybrid cross between the male lion and a female tiger. Ligers do not exist in the wild, only in captivity because tigers have habitats mostly in Asia and lions mostly in Africa and besides that they are mortal enemies in the wild ready to kill one another when confronted.
It is believed that there are only few living ligers around the globe, and the most famous of them all is called Hercules. Hercules comes from the Institute of Greatly Endangered and Rare Species, in Miami, Florida.
Hercules’ birth was completely accidental, a result of an affair between tigress and one of the lion males at the Institute.
Hercules currently weighs more than 900 pounds, he is 6-feet-tall and 12-feet-long and holds the Guinness World Record for the largest cat in the world. He is also able to eat 100 pounds of food in just one sitting
Ligers are distinct from the similar hybrids tiglons (female lion + male tiger) which tend to be about as large a female tiger.

http://sciencefactsandarticles.blogspot.com/2011/10/interesting-facts-about-ligers.html