Sooretama Slaty Antshrike
Thamnophilus ambiguus
The Sooretama slaty antshrike is 14 to 15 cm (5.5 to 5.9 in) long. 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 have a black forehead and crown with a few gray spots on the former. Their back is gray with a black spot in the middle and a hidden white patch between the scapulars. Their face is gray. Their wings and wing coverts are black with white spots and edges. Their tail is black with white tips and spots on the feathers. Voice: The Sooretama slaty antshrike's song is a "cackling series, starting high and rising, then finishing as a short, sometimes descending rattle". Its call is a "level high, cackling 'witwitwit' or 'witrrr' ".
ID text from Wikipedia, CC BY-SA 4.0
White-shouldered Antshrike
Thamnophilus aethiops
The white-shouldered antshrike is 15 to 17 cm (5.9 to 6.7 in) long and weighs 23 to 30 g (0.81 to 1.1 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 T. a. aethiops are mostly black. They have a few white spots on their wing's lesser coverts and the bend of the wing, white underwing coverts, and a blackish gray lower belly and crissum. Adult females are entirely deep reddish brown. Voice: The male white-shouldered antshrike's song is "a short and slowly paced...series of low-pitched, complaining notes delivered at steady pace and even pitch and intensity"; female song is similar but higher-pitched. It has been written as "anh...anh...anh...anh...anh" given at about one note per second.
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: Sooretama Slaty Antshrike and White-shouldered Antshrike.