The flatfish has one eye that moves to the other side of its head.
Edit: to clarify: two eyes, one of which moves to the other side of its head as it grows. Richard Dawkins is fond of this example, using it in The Blind Watchmaker and The Greatest Show On Earth.
The flatfish has one eye that moves to the other side of its head.
Edit: to clarify: two eyes, one of which moves to the other side of its head as it grows. Richard Dawkins is fond of this example, using it in The Blind Watchmaker and The Greatest Show On Earth.