Taking into consideration its size, an ancient relative of piranhas weighing about 20 pounds delivered a bite with a force more fierce than prehistoric whale-eating sharks, the four-ton ocean-dwelling Dunkleosteus terrelli and – even – Tyrannosaurus rex. This research was done by biology doctoral student Stephanie Crofts, who works in Adam Summers‘ lab at Friday Harbor Labs. Read more about megapirahna here!