Ligers grow much bigger than both lions and tigers. This may be because of imprinted genes that are only expressed when inherited from a certain parent, the upshot of which is that they either get a boost in genetically-ordained growth or miss out on a growth inhibitor. The same thing sometimes occurs in dog cross-breeds.
It is not inconceivable that a viable shark hybrid is possible with a similar effect, that could lead to giant sharks. If that doesn't interest you guys I don't know what will.
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