Chestnut-backed Antshrike
Thamnophilus palliatus
The lined antshrike is 16 to 17 cm (6.3 to 6.7 in) long and weighs 26 to 28 g (0.92 to 0.99 oz). Members of genus Thamnophilus are largish members of the antbird family; all have stout bills with a hook like those of true shrikes. This species exhibits some sexual dimorphism though both sexes have a crest. Adult males of the nominate subspecies T. p. palliatus have a black crown with white spots on the forehead. Their face and nape are black with white spots. Their upperparts, wings, and tail are rufous-brown. Voice: The chestnut-backed antshrike's song is "a moderately long...accelerating series of similar, rapidly delivered, somewhat nasal notes, pitch rising slightly initially, more clearly falling towards end, terminating in longer, firmly accented, downslurred note". It has been written as kah kah-kah-kah-ka'ka'ka'kaka'pah".
ID text from Wikipedia, CC BY-SA 4.0
Plain-winged Antshrike
Thamnophilus schistaceus
The plain-winged antshrike is 13 to 14 cm (5.1 to 5.5 in) long and weighs 19 to 21 g (0.67 to 0.74 oz). Members of genus Thamnophilus are largish members of the antbird family; all have stout bills with a hook like those of true shrikes. This species exhibits significant sexual dimorphism. Adult males of the nominate subspecies are almost entirely gray, with slightly darker upperparts than underparts. Their wings and wing coverts have a slight brownish tinge. Adult females have a rufous crown and a grayish face. Their upperparts are yellowish olive-brown and their underparts pale olive-brown. Voice: The plain-winged antshrikes's song differs somewhat among the subspecies. In general it is "a slightly accelerating series of similar notes at same pitch, ending in sharply downslurred note that 'falls off' to a lower pitch". Both the number of notes and pace vary; the song of subspecies T. s.
ID text from Wikipedia, CC BY-SA 4.0
Where you might meet both
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Play today's Daily BirdPhotos and recordings are credited to their authors under the licence shown. Full profiles: Chestnut-backed Antshrike and Plain-winged Antshrike.