Not quite true about ligers and tigons
For male lions, it is said that the male's genetics work towards creating a larger animal, because the larger offspring has a better chance than any other smaller offspring, thus ensuring that males lineage goes on. The female lioness genes work against the males gene's motive to grow largest, promoting survival of all the cubs she carries.
Tiger males however, do not push for a larger offspring, which creates a smaller animal born in the cross.
I read that at messybeast.com a while ago. Found it interesting. Not sure how accurate it is, though most of that site is spot on.
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