Saguaro National Monument cactusesThe saguaro cactus is the largest in the United States and can live for up to 150 years and grow to a height of 50ft © Jörn Friederich - age fotostock
Often like deserts, the states more to the south have relatively sparse vegetation, but with a couple of pretty surprises. The Sonora Desert Museum gives a very complete view of the fauna in these little watered areas.