Straneck's Tyrannulet

Straneck's tyrannulet is 9 to 11 cm (3.5 to 4.3 in) long and weighs 4.4 to 7.5 g (0.16 to 0.26 oz). The sexes have the same plumage. Adults have a gray crown and nape with a hidden bit of white on some black central crown feathers. They have a thin white supercilium, a white crescent under the eye, and a dark gray line through the eye on an otherwise grayish white face. Their upperparts are olivaceous brown. Their wings are dusky brownish gray with lighter edges to most of the flight feathers and two cinnamon to whitish wing bars. Voice: The main vocalization of Straneck's tyrannulet is "a high-pitched but not far-carrying 'twie tirrrrrrrrrrrrrrrrrr', occasionally with the first or second portions emitted alone". Its alarm call is "a more powerful, high-pitched 'tie...tie...tie...tie...' " of three to five notes.