Bay Wren
Cantorchilus nigricapillus
The bay wren is 12.6 to 15.6 cm (5.0 to 6.1 in) long. Eight specimens from Panama weighed 17.7 to 26.3 g (0.62 to 0.93 oz). Adults of the nominate subspecies have a black face with a narrow white supercilium, a partial eyering, and a white patch at the back of the cheek. Their crown and nape are black and the rest of the upperparts are rich chestnut. The tail is a rich brown with bold black bars. The throat and breast are white, transitioning to rufous brown on the lower belly and flanks. Black bars cross the underparts from the breast to the vent area. Voice: The bay wren's song is loud, "a rapid repetition of clear, rich-toned, slurred, ringing whistles, trills, and warbles" sometimes given antiphonally. The species has a number of calls.
ID text from Wikipedia, CC BY-SA 4.0
Cabanis's Wren
Cantorchilus modestus
Cabanis's wren is 12.5 to 14 cm (4.9 to 5.5 in) long. Two males weighed 17.8 and 19.1 g (0.63 and 0.67 oz) and two females 16.0 and 16.6 g (0.56 and 0.59 oz). Adults have a dark gray-brown crown, a rufous-brown back, an orange-rufous rump, and a rufescent brown tail with narrow darker bars. They have a white supercilium, a gray-brown stripe behind the eye, and cheeks mottled gray-brown and gray-white. Their throat is white, the chest pale grayish buff, and the belly buffy white between orange-buff flanks. Voice: The song of Cabanis's wren is "a loud motif of 3–4 clear whistles" . Its calls include a "harsh 'chur' and a "rippling, tinkling 'chi-cho-chi'" .
ID text from Wikipedia, CC BY-SA 4.0
Where you might meet both
Learn this pair in BeakBrain
Photo and call practice, free in any browser.
Play BeakBrainPhotos and recordings are credited to their authors under the licence shown. Full profiles: Bay Wren and Cabanis's Wren.