While melanin is one of the pigments behind human skin and hair color, bloodworms somehow make it into a tough material infused with copper, which makes up a whopping 10 percent or so of the fangs ...

Bloodworms (Glycera dibranchiata) are segmented, bright-red marine worms that can grow to be 14 inches (35 centimeters) long and have 0.08-inch-long (2-millimeters) needle-like teeth made from a ...