The wolf spider has a range that spans most of the United States. They are relatively large spiders, and they travel in packs of 10-40 spiders, much like wolves from which they derive their name. Also similar to wolves, they often make subtle howling sounds with their thorax which is often mistaken for the sound of wind.
Wolf spiders can be spotted by shining a light into the desert at night. Their eyes reflect the light in a green-ish yellow tint. They are always watching.