What has no eyes, but can see? No ears, but can hear? No legs, but can still travel quite easily? Give up? The answer's an earthworm. You barely hear them, and rarely see them, but earthworms are among the most important creatures on the planet. They may seem like just more creepy crawlies, but without earthworms working hard on our dirt, we'd have a very difficult time growing our flowers, our trees, and even our food. Filled with interesting, easy-to-understand...