There is no doubt about it, Ligers are the undisputed heavyweight champion of the feline world. Unfortunately because of the different numbers of chromosomes possessed by tigers and lions male ligers are born sterile. And the reason why that one particular liger is so massive is because its father was a lion and its mother a tiger. I believe there is a gene (some kind of growth inhibitor) possessed by female lions which prevents their offspring from getting too big but since this guy's mum was a tiger he's grown to gargantuan proportions.

Freakish isn't it? That liger looks like some uber-cat that might have walked the Earth during Pleistocene era.