Sinaloa Wren is a medium sized wren that is endemic to western Mexico. Its range has been expanding northwards in recent decades, however, and Sinaloa Wren now is a rare but regular visitor to southern Arizona (United States). This wren inhabits the understory of tropical deciduous forest. It feeds on insects, and its voice is complicated and very harmonic. Sinaloa Wren is widespread and common, but its natural history is not described in much detail.