Great Rufous Woodcreeper
Xiphocolaptes major
The great rufous woodcreeper is the largest, though not the heaviest, member of its subfamily. It is heavy-bodied with a long, heavy, somewhat decurved bill. It is 27 to 34 cm (11 to 13 in) long. Males weigh 120 to 150 g (4.2 to 5.3 oz) and females 120 to 162 g (4.2 to 5.7 oz). The sexes have the same plumage. Adults of the nominate subspecies X. m. major are almost entirely bright rufous-cinnamon. Their crown is slightly darker, their tail more chestnut, and their flight feathers reddish brown with dusky tips on the primaries. Voice: The great rufous woodcreeper's song is a "slightly descending series of 5-8 double-noted whistles, like 'wéettuck - -'." It has a "loud, ringing quality". The species gives a "two-part call... emphatic...'eeehr-eek!'."
ID text from Wikipedia, CC BY-SA 4.0
Strong-billed Woodcreeper
Xiphocolaptes promeropirhynchus
The strong-billed woodcreeper one of the largest members of the ovenbird family and is the heaviest woodcreeper, though the slender long-billed woodcreeper (Nasica longirostris) is longer and the great rufous woodcreeper (Xiphocolaptes major) is larger overall. The strong-billed is 28 to 31.5 cm (11 to 12 in) long. Weights range between 103 and 144 g (3.6 and 5.1 oz). The sexes have the same plumage. Adults of the nominate subspecies X. p. promeropirhynchus have a dark brown crown and nape with buff streaks. Voice: The strong-billed woodcreeper sings mostly at dawn and dusk. Its vocalizations vary among the populations, but very generally are "a long, ringing, descending sequence of 4-8 or 3-10 disyllabic whistles". In northern Central America it makes "a thin, nasal, rising teeeeuuuuuWEEEK!" that falls in volume during a long series. In Costa Rica it "repeats a loud KEW-WEE about 10 times.
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: Great Rufous Woodcreeper and Strong-billed Woodcreeper.