Unicolored Antwren

The unicolored antwren is 9 to 10 cm (3.5 to 3.9 in) long and weighs 6.5 to 8 g (0.23 to 0.28 oz). It is a smallish bird with a short tail. Adult males are almost entirely gray, with lighter underparts than upperparts. Their throat feathers have black bases and gray tips. Adult females have olive-brown upperparts with a grayish tinge on the crown and nape and yellowish brown uppertail coverts. Their wings are dark grayish brown with reddish yellow-brown edges on the flight feathers. Their tail is reddish yellow-brown. Voice: The unicolored antwren's song is an "irregular series of very high, sharp, drawn-out, well-separated 'Seeep' notes". Its calls include a "sharp 'wheet' ", "paired nasal notes", and "longer, flat, raspy notes".