Olive-backed Woodcreeper
Xiphorhynchus triangularis
The olive-backed woodcreeper is 19.5 to 25 cm (7.7 to 9.8 in) long, males weigh 40 to 52 g (1.4 to 1.8 oz) and females 32 to 48 g (1.1 to 1.7 oz). It is a medium-sized member of genus Xiphorhynchus, with a slightly decurved bill. The sexes have the same plumage. Adults of the nominate subspecies X. t. triangularis have a finely streaked face with a buffy supercilium and eyering. Their crown and nape are blackish brown with pale buff elongated spots. Their back, wing coverts, and rump are bright olive to brownish olive. Their upper back has scattered buff streaks. Voice: The olive-backed woodcreeper appears to be less vocal than many others of its genus. Its song is "a series of hard notes that accelerates then slows, 'we we we-we-we-we-we-WE-WE-We-we-wa' ". It also has a fainter song, "a weak and somewhat nasal series that accelerates into a slow trill, 'quee, quee QUEE-que-que'e'e'e'e'.
ID text from Wikipedia, CC BY-SA 4.0

Striped Woodcreeper
Xiphorhynchus obsoletus
The striped woodcreeper is medium-sized, with a slim, slightly decurved bill of moderate length. The species is 18 to 20.5 cm (7.1 to 8.1 in) long. Males weigh 27 to 37 g (0.95 to 1.3 oz) and females 24 to 36 g (0.85 to 1.3 oz). The sexes have the same plumage. Adults of the nominate subspecies X. o. obsoletus have a face with thin creamy buff and dark brown streaks that become bold scaling on the sides of the neck. They have a faint pale supercilium or none at all. Their crown and nape are blackish to dark olive-brown with pale spots that have dusky edges. Voice: The striped woodcreeper sings mostly at dawn and dusk, and also intermittently during the day. Its song is "a trill...20–35 sharp notes, first stuttering, then speeding up slightly, rises conspicuously at end, 'che-e-e-e-e-e-ee-ie-ie-iek!'." Its calls include "sip", "ti-dik", and a "dry twittering 'tit-it-it' or 'si-si-sip' ".
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: Olive-backed Woodcreeper and Striped Woodcreeper.