Andean Slaty Thrush

The Andean slaty thrush is 18 to 23.5 cm (7.1 to 9.3 in) long and weighs 50 to 67.5 g (1.8 to 2.4 oz). The species is sexually dimorphic. Adult males have a mostly slate-gray head with a pale eye-ring and a dark-streaked white throat. Their upperparts, wings, and tail are slate-gray. Their underparts are a slightly paler slate-gray; birds in the north of their range have darker underparts than those in the south. Adult females have a greenish brown head and upperparts and somewhat paler greenish brown underparts. Both sexes have a dark iris, a yellow bill, and yellow legs and feet. Voice: The Andean slaty thrush sings only in the austral summer breeding season. Its song is usually given from a hidden perch and is a ventriloquial "series of rather high, jumbled phrases, some notes high-pitched, rapid, shrill and burry but followed by long pause, tji tjihe tjie tjihe or swidrielipik tillie.