Memorial for Steve Irwin --

Who knew stingrays were so dangerous?
Stingrays do not attack people, however if it is stepped on, the stingray will utilize its spine as a form of defense.
The tail of the stingray that killed Irwin is capped with a roughly 8-inch spear made of the same stuff that makes up shark scales, known as dermal denticles. The spear, which stiffens when the stingray feels threatened, is serrated like a steak knife and packs a venom that can be deadly to predators.