text: we know that sharks and cockroches are ultimate surviors....? in the event of a massive catastrophe....which species will be the ultimate survivor and why....gives details. very little natural causes can harm sharks, as they have no bones and a wicked immune system. cockroaches are impossibly durable, can survive on almost nothing, eat almost anything, and have an incredible reproductive system. the roaches would win, they can survive a frickin nuclear explosion.