North American deserts are arid regions characterized by low rainfall and extreme temperatures. The main deserts include the Mojave, Sonoran, Chihuahuan, and Great Basin deserts. These areas support unique ecosystems with specially adapted plants and animals, such as cacti and desert tortoises. The Mojave Desert is known for its iconic Joshua trees, while the Sonoran Desert is famous for its diverse flora, including the giant saguaro cactus. The Chihuahuan Desert spans parts of Mexico and the United States, featuring a mix of grasslands and shrublands. The Great Basin Desert is the largest desert in the U.S., primarily consisting of cold desert landscapes.