Green-backed Sparrow
Arremonops chloronotus
The green-backed sparrow is 15 to 16 cm (5.9 to 6.3 in) long and weighs 24 to 31 g (0.85 to 1.1 oz). The sexes have the same plumage. Adults of the nominate subspecies have a mostly slate gray head with wide black or brownish black strips on each side of the crown, a black or brownish spot in front of the eye, and a long black or brownish stripe behind the eye. Their upperparts, tail, and wings are bright olive green with canary yellow on the edge of the wings. Voice: The subspecies of the green-backed sparrow have different songs. That of the nominate is "of even pace...with well-spaced song elements, sit-cheet-sueew-sueew-sueew-sueww-sueww or a slightly faster sueet!-wip-seet!-chew-chew-chew-chew-chew-chew-chew-chew-chew-chew-chew". That of subspecies A. c.
ID text from Wikipedia, CC BY-SA 4.0
Olive Sparrow
Arremonops rufivirgatus
The olive sparrow is about 12 to 14 cm (4.7 to 5.5 in) long and weighs 15 to 30 g (0.53 to 1.1 oz). The sexes have the same plumage. Adults of the nominate subspecies have a brown crown with a wide olive gray stripe through its middle and down the nape. They have drab to olive brown lores, a wide buffy gray supercilium, and a thin brown line through the eye on an otherwise gray face. Their upperparts are uniformly olive. Their tail is brownish olive to olive with light yellowish outer edges on the feathers. Voice: Only the male olive sparrow is believed to sing. Its song is an "accelerating series of somewhat musical, downslurred tsip, chip, or tsew notes, usually dropping in pitch at the end of the series", and has been described "as sounding like a metallic ball bouncing on a concrete floor".
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: Green-backed Sparrow and Olive Sparrow.