- The Cactus Wren (Campylorhynchus Brunneicapillus) is the official state bird of Arizona and is a ubiquitous year-round resident across the Sonoran Desert of southern Arizona - Measuring 7 to 9 inches long, it holds the title of the largest wren species in the United States - Features a prominent white eyebrow stripe, a heavily spotted white chest, and a long, slightly curved bill - Sporting a brown back with heavy white streaks, it keeps its tail down rather than cocked upward like other wrens - Its unmistakable song sounds like a harsh, rhythmic rasping, often compared to an automobile engine struggling to start - Unlike small, secretive wrens, the Cactus Wren is highly bold, curious, and conspicuous ... it spends much of its time strutting out in the open on the desert floor flipping over rocks to look for food - It thrives in extreme heat because it rarely drinks free-standing water; instead, it extracts almost all of its required moisture from its diet of insects, seeds, and ...