Greater Wagtail-Tyrant

The greater wagtail-tyrant is 14 to 16 cm (5.5 to 6.3 in) long and weighs 8.5 to 13.2 g (0.30 to 0.47 oz). The sexes have the same plumage; males are slightly larger than females. The nominate subspecies S. b. budytoides is the largest and S. b. gracilis is the smallest. Adults of the nominate subspecies have a bright yellow supercilium from the bill to past the eye, a blackish line through the eye, and dusky ear coverts on an otherwise yellowish face. Their crown and upperparts are grayish olive. Voice: Greater wagtail pairs often sing in duet, a "high, liquid series of 'Wee-tjer- -' from one bird and 'tidrrr- -' from the other". The two vocalizations are also described as "whididideteh" and "tri-ti-treeowhit". The species also makes an "brupt 'churt', sometimes in series, varied occasionally into more complex chatter".