The Cactus Wren (Campylorhynchus brunneicapillus) is a species of wren that is native to the southwestern United States southwards to central Mexico. The Cactus Wren is the largest North American wren, at 18-23 cm (7.1-9.1 in) long. Unlike the smaller wrens, the Cactus Wren is easily seen. It has the loud voice characteristic of wrens. The Cactus Wren is much less shy than most of the family.