Northern Slaty Antshrike
Thamnophilus punctatus
The northern slaty antshrike is 13 to 15 cm (5.1 to 5.9 in) long and weighs 16 to 18 g (0.56 to 0.63 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. p. punctatus have a gray forehead and a black crown. Their back is gray with a few black feather tips and a hidden white patch between their scapulars. Their face is gray. Their wings and wing coverts are black with white spots and edges. Voice: The northern slaty antshrike's song is "an accelerating series of usually 10–15 progressively shorter notes starting with laboured, slow-paced notes that are countable, ending with trill of abrupt uncountable notes often sounding higher in pitch". Its pace varies among the subspecies; that of T. p. leucogaster is the fastest.
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: Northern Slaty Antshrike and White-shouldered Antshrike.