Bay-ringed Tyrannulet

The bay-ringed tyrannulet is about 12 cm (4.7 in) long and weighs about 8 g (0.28 oz). The sexes have the same plumage. Adults are rufous-chestnut at the lores whose color extends to a wide eye-ring. The upper part of their face is olive and the lower part pale yellow. Their crown and upperparts are bright olive. Their wings are dusky with olive edges on the flight feathers. Their wing coverts are dusky with pale yellow tips that form a wing bar. Their tail is dusky with olive edges to the feathers. Voice: The bay-ringed tyrannulet's song is a "rapid, almost level twittering, sounding (simplified) like twitwi--twididirit-tjutju". The twi notes are extremely high and the tjutju descends and is low pitched.