Cactus wren, Campylorhynchus brunneicapillus. Common throughout the deserts of southwest U.S. and Mexico. Cactus Wrens do not migrate, staying with a chosen mate and defending their territory. They are the largest wren of North America and have about six recognized subspecies. They are primarily insectivores but will also eat seeds, fruits, and small reptiles. Pairs will build globular nests in cacti, with a strong preference for the jumping cholla cactus. They are still in good standing with conservation, but certain populations have started declining due to habitat loss, habitat fragmentation, and introduced predators.