Slaty-capped Shrike-Vireo

The slaty-capped shrike-vireo is 14 to 15 cm (5.5 to 5.9 in) long; the nominate subspecies V. l. leucotis weighs 21.5 to 30 g (0.76 to 1.1 oz). The sexes have the same plumage. Adults of the nominate subspecies have a blue-gray crown and nape. They have a bright yellow forehead, supercilium, and crescent below the eye. Their lores are dull blackish gray. They have a deep grayish blue stripe through the eye and "moustache" on an otherwise dull white face. Their upperparts and tail are bright olive-green. Voice: The slaty-capped shrike-vireo's song is a "single loud melodious descending whistle tyeer or eear, seemingly endless repeated", with some variation among the subspecies. That of subspecies V. l. mikettae is the most distinctive; its whistles are longer than the others' and are on almost the same pitch rather than descending.