Super-sized flesh-eating lizards, 42-foot-long serpents and huge head-butting killer birds may sound like something from the latest sci-fi flick, but these monstrous Goliaths actually did terrorize the Earth, albeit millions of years ago.
And although certain prehistoric predators were early ancestors of some lethal animals that are alive today, the primeval versions were superlative to their modern counterparts in seemingly every way: bigger, faster and deadlier. Here are the top 20 prehistoric giants of land, sea and air.
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