Human biology is amazing, but it has its limits. While we need technologies to change things like the color of our eyes, or to get a brand new set of teeth, some animals have the natural ability to do these things themselves. Such show-offs.















Human biology is amazing, but it has its limits. While we need technologies to change things like the color of our eyes, or to get a brand new set of teeth, some animals have the natural ability to do these things themselves. Such show-offs.