Olive Sparrow

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".