Photos by Marty Horowitz
From the link (All about Birds):
No bird exemplifies Southwestern deserts better than the noisy Cactus Wren. At all hours of the day they utter a raw scratchy noise that sounds like they are trying to start a car. Cactus Wrens are always up to something, whether hopping around on the ground, fanning their tails, scolding their neighbors, or singing from the tops of cacti. They build nests the size and shape of footballs which they use during the breeding and nonbreeding season. Cactus Wrens are true desert dwellers; they can survive without needing to drink freestanding water.
The Cactus Wren is the state bird of Arizona!
From the link:
The Rock Wren usually builds a pavement or walkway of small, flat stones or pebbles that leads to the nest cavity. The nest is usually located in a rock crevice out of sight, but the pavement may give away the nest's location. The function of this pavement is unknown.
The Rock Wren also needs no standing water to drink.