Lemmings have been given a bum rap. What other myths need to be dismissed?

Piranhas prefer to feed on carrion and tend to avoid live targets. In the late 1800s Teddy Roosevelt was pranked into believing that piranhas attack humans when he saw a school of them devour a dead cow within minutes. What he didn’t know was that this particular school hadn’t been fed in over a week so naturally they attacked the first food they saw. The truth is piranhas avoid humans swimming in their waters and prefer meat that’s already dead.