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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.
Source: ABC News
Source: Live Science
Sources: The Conversation, Smithsonian Magazine
Source: ABC Science
Source: National Geographic
Sources: Wired, Science Daily
Sources: Phys.org, National Geographic