Apolinar's Wren

Apolinar's wren is 12 cm (4.7 in) long. A male C. a. hernandezi weighed 17.7 g (0.62 oz). Nominate adults have a chestnut crown, blackish brown shoulders and upper back with whitish buff streaks, and bright reddish brown lower back and rump. Their tails are reddish with blackish brown barring. They have a faint supercilium that is a bit lighter than the rest of the gray-brown face. Their underparts are buff-brown that is lighter on the throat and more reddish on the lower flanks. Voice: The nominate male's song is "a series of rising and falling churrs mixed with harsh gravelly notes" and it may have six or seven variations on it . C. a. hernandezi has at least 11 song types; females also sing and both may sing in duet .