The American Tree Sparrow is a small passerine bird in the sparrow family that is also known as the Winter Sparrow. Their common name is due to their preference for coniferous forests across North America during winter. Some synonyms for the American Tree Sparrow include the Bay-winged Sparrow, Eastern Tree Sparrow, and Arctic Sparrow. These delightful birds measure around six inches long and weigh less than half an ounce. They have a distinctive brown cap with a rust-colored eye stripe, and their plumage is streaked brownish on the upperparts and grayish underneath. The American Tree Sparrow is a beautiful bird species and a delightful sight to behold.