Did you know that not every kind of animal has the same type of eyes? Tigers can see six times better at night than humans. Owls are the only birds that can see the color blue. Most hamsters only blink one eye at a time. And, worms have no eyes at all! Learn about all the unique and interesting types of eyes in Animal Eyes by Mary Holland and Eye to Eye: How Animals See the World by Steve Jenkins. If your interested in your own eyes, check out Eye: How It Works by David Macaulay.
Just for fun, try tricking your eyes with some books about optical illusions – What in the World: Fun-Tastic Photo Puzzles for Curious Minds by Julie Vosburgh Agnone and X-Treme Illusions by National Geographic Kids. You can even learn how to make your own optical illusion!