They're tiny—but they're fierce! Thanks to weapons and defenses such as powerful venom (or just their ability to carry disease), some of Earth's smallest creatures can be its most deadly. In this detailed guide, readers will learn about how the most miniscule of animals—including the black widow spider, the poison dart frog, the blue-ringed octopus, and more—can be dangerous. Vital statistics features point out details about these fascinating animals, and full-color photographs give them an up-close look at even the tiniest of creatures.