Southern Beardless Tyrannulet

The southern beardless tyrannulet is 9.5 to 10.5 cm (3.7 to 4.1 in) long and weighs 7 to 9 g (0.25 to 0.32 oz). It is a small flycatcher with a long pointed warbler-like bill. The sexes have the same plumage. Adults of the nominate subspecies C. o. obsoletum have a grayish crown and nape; the crown feathers are often bushy with dark centers. They have white lores and a broken white eyering on an otherwise grayish white face. Their upperparts and tail are medium olive-gray. Their wings are dusky with whitish to creamy edges on the inner flight feathers. Voice: The southern beardless tyrannulet has a variety of vocalizations. They include a "hin, high whistle, 'fleeeeer', rising and falling slightly, sometimes with terminal syllables, 'fleeeeee-pit-pit' " and a "descending series of clear, minor-key notes, 'fleee, flee-fleew-fleew' ". When calling it often raises its crest.