The most common adjective people seem to associate with Arizona is “dry.” Many factors combine to create an ecosystem that many label as desert.  The amount of  annual precipitation alone, 10 inches or less, is not the whole story.  Arizona is also sunny, sometimes windy and experiences temperature extremes.  During a twenty-four hour period, a range of 40 degrees is not unusual. These extremes increase
the amount of water that escapes back into the air. The composition of the soil also affects how much water is available.  Yet, Arizona is not devoid of plant and animal life.  Our deserts and high mountain ranges support abundant flora and fauna that is well-adapted to this arid home. Plants and animals here are expert conservationists to make the most of what moisture is available.

Much of the Sonoran Desert depends on seasonal rainfall and responds quickly to a brief storm.

Wet Beaver Creek is an oasis in the Sonoran desert in northern Arizona. It is a perennial stream that is a crucial source of water for elk, bear, deer, mountain lion, small animals and birds.

The Willcox Playa is an ancient lake bed in southern Arizona that receives only occasional rain but is an important stopover for migratory birds.