Eurasian Tree Sparrow
Passer montanus
The tree sparrow is 12.5–14 cm (5–5+1⁄2 in) long, with a wingspan of about 21 cm (8.3 in) and a weight of 24 g (0.85 oz), making it roughly 10% smaller than the house sparrow. The adult's crown and nape are rich chestnut, and there is a kidney-shaped black ear patch on each pure white cheek; the chin, throat, and the area between the bill and throat are black. The upperparts are light brown, streaked with black, and the brown wings have two distinct narrow white bars. The legs are pale brown, and the bill is lead-blue in summer, becoming almost black in winter.
ID text from Wikipedia, CC BY-SA 4.0
House Sparrow
Passer domesticus
The plumage of the house sparrow is mostly different shades of grey and brown. The sexes exhibit strong dimorphism: the female is mostly buffish above and below, while the male has boldly coloured head markings, a reddish back, and grey underparts. The male has a dark grey crown from the top of its bill to its back, and chestnut brown flanking its crown on the sides of its head. It has black around its bill, on its throat, and on the spaces between its bill and eyes (lores). Voice: Most house sparrow vocalisations are variations on its short and frequent chirping call. Transcribed as chirrup, tschilp, or philip, this note is made as a contact call by flocking or resting birds; or by males to proclaim nest ownership and invite pairing.
ID text from Wikipedia, CC BY-SA 4.0
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