Did you read the last line of the link you posted?
"Patrick (a li-liger) is one of the fortunate few and was saved through the generosity of The Roar Foundation. He now lives a life of ease and gets great enjoyment from spraying unwary "visitors. "
Well, my Maine Coon is also a cat, but no way he's breeding with a female tiger. Though I'm sure he'd give it the old college try.
The liger example shows, IMO, that speciation is a gradual process with lots of gray areas. As species drift further apart, such as house cats and lions, it becomes clear that they are distinct. However, some species are still close enough that thay can interbreed.