Olivaceous Woodcreeper
Sittasomus griseicapillus
The olivaceous woodcreeper is one of the smallest members of its subfamily. It has a slim body and a short straight bill, and unlike most other woodcreepers has no streaks or spots. The sexes' plumages are alike but females average smaller than males. Adults are 13.1 to 19.3 cm (5.2 to 7.6 in) long. Males weigh 9.0 to 18.0 g (0.32 to 0.63 oz) and females 8.6 to 16.0 g (0.30 to 0.56 oz). Length and weight vary geographically. All subspecies have a dark iris, a dark gray to black maxilla, a black to light gray mandible with a darker tip, and gray, bluish gray, or black legs and feet. Voice: The olivaceous woodcreeper's vocalizations vary widely across the subspecies. There are at least six song types and can be sorted into two groups. Subspecies in Middle America, northern South America, and west of the Andes make "a rapid staccato trill or thin rattle". Those in Amazonia and eastern and southeastern Brazil make "a rapid, alternating series of clear whistles". The song of S. g.
ID text from Wikipedia, CC BY-SA 4.0
Streak-headed Woodcreeper
Lepidocolaptes souleyetii
The streak-headed woodcreeper is 19 to 21 cm (7.5 to 8.3 in) long and weighs 23 to 31 g (0.81 to 1.1 oz). It is a slim, medium-sized woodcreeper with a longish, slender, decurved bill. The sexes have the same plumage. Adults of the nominate subspecies L. s. souleyetii have a face with thin whitish buff and dark brown streaks; the sides of the neck are more heavily streaked. They have a whitish buff supercilium and eyering. Their crown and nape are dark brown with bold whitish buff streaks that often extend onto the upper back. Their back and wing coverts are rufous-olive to cinnamon-brown. Voice: The streak-headed woodcreeper's song has been described as "a simple, descending, clear trill, soft and melodious", "a clear musical descending trill that lasts 1.5-3 seconds", "a high-pitched, thin, flat trill, p'e'e'e'e'e'e'e'eeeaaa, rapid and descending throughout, ca 2-2.5 sec.", and as "a loud, ringing, rapid, descending series of puttering notes: pee'i'i'i'i'i'i'i'i'i'i'i'i'i'i'i'i'ew".
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: Olivaceous Woodcreeper and Streak-headed Woodcreeper.