The cactus wren (Campylorhynchus brunneicapillus) is a large wren that is endemic to the deserts of the United States and Mexico. It is the state bird of Arizona. The wren's upperparts are brown with black and white spots and the underparts are cinnamon-buff with a whiter breast; it has striking white eyebrows. The song is loud and raspy. Cactus wrens are ground feeders and eat mainly insects, with some plant material; they can meet their water needs from their diet. The wrens use saguaro and cholla cacti as nesting sites, which provide protection for their large bulky nests and their young. The wrens are non-migratory and territorial around their nests. Pairs are monogamous; males build nests, females incubate eggs, and both parents feed chicks. Populations have declined due to human activities, habitat loss and introduced species including cats, but the wrens still number in the millions. The species is classed as being of least concern by the International Union for Conservation of Nature. (Full article...)