Ichthyosaurs were silent assassins of Jurassic seas

Breakthroughs, discoveries, and DIY tips sent every weekday. More than 180 million years ago, ichthyosaurs ruled the early Jurassic oceans. The carnivorous marine reptiles ranged from the size of a briefcase to larger than a school bus. The biggest of these whale-like creatures were apex predators, hunting ancient fish, ammonites, and even their smaller reptile relatives. As they searched for prey, some may have swum with surprising stealth.