Birds
Cactus Wren
Campylorhynchus brunneicapillus · also called cactus wrens
A cactus wren builds its bulky, football-shaped nest deep inside a cholla cactus, letting the plant’s own dense spines do the work of keeping predators away from the eggs inside. It usually builds several more nests around the territory besides, decoys and backups scattered through a landscape already well defended by thorns.
Overview
The cactus wren, Campylorhynchus brunneicapillus, is the largest wren species in the United States, found across desert habitat in the American Southwest and Mexico. It builds bulky nests within cactus spines and tolerates extreme heat that sends other birds into shelter.
Borrowing a cactus’s defenses
Rather than developing its own elaborate nest defense, the cactus wren simply lets its cactus host do the job, tucking a well-built nest deep enough into the spines that most predators never get close enough to try.
Status
Least Concern — widespread and stable across suitable desert habitat throughout the American Southwest and Mexico.
Cactus Wren: common questions
Why does the cactus wren build its nest inside a spiny cactus?
A cactus wren builds its bulky, football-shaped nest deep within the protective spines of a cholla or saguaro cactus specifically to take advantage of the plant's own defenses, since the dense spines make it considerably more difficult for predators to reach the eggs or chicks compared with a more exposed nesting location.
Why does a cactus wren build more nests than it actually uses?
A cactus wren pair frequently constructs several nests within their territory beyond the single one used for raising young in a given season, with the additional nests potentially serving purposes such as decoys to confuse predators, alternative roosting sites, or backup options if the primary nest is damaged or compromised.
What does a cactus wren's call sound like?
A cactus wren produces a loud, harsh, repetitive call often described by listeners as sounding somewhat like a car engine struggling to start, a distinctive and far-carrying sound that makes the species easy to identify by ear even before it comes into view.
Is the cactus wren an official state symbol?
Yes, the cactus wren is the official state bird of Arizona, a designation that reflects the species' strong and enduring cultural association with the desert Southwest landscape where it is a common and characteristic year-round resident.