

A bird which prefers colder climates an can tolerate subzero temperatures, the American Tree Sparrow spends the summer in the tundra zone and winters across central North America. It nests on or very near the ground, building a cup of plant fibers lined with feathers, in which it lays four or five pale blue eggs, speckled with brown. These are incubated by the female for just under two weeks and the young leave the nest to start fending for themselves after around 9-11 days. The adult is a large sparrow and has a long; slightly notched tail and a bill that is dark above and yellow below. It has a chestnut cap and eye stripe, a gray head and nape, gray under parts with a dark spot at the centre of the breast and a chestnut patch at the side, a red-brown back with dark streaking, and two white wing bars. Birds in the west tend to be paler than those in the east. The American Tree Sparrow mainly eats seeds, but will also take insects and spiders.