House Sparrow nest in a Two-holed Mansion built by Linda Violett from my no-trap Hill Trail. Notice the difference in marking. The house sparrow is a compact bird with a full chest and a large, rounded head. However, we recommend leaving them to complete the cycle for this one nesting period, and bear in mind that virtually all birds but starlings and house sparrows are protected by federal law, and to remove their nests or eggs would be illegal. This procedure won’t work with eggs, and you can remove house sparrow eggs when cleaning nest material out of ducts. These two eggs were found in one nest (H-11 on 05/19/07). Sparrows typically lay eggs during the nesting period in early spring and summer. While House Sparrows may or may not be the most loved birds, they certainly are a part of our backyard bird watching experience. House Sparrow eggs from two different nests. Makes me wonder about egg dumping. HOSP eggs from the Hill Trail - again notice variability in coloring and markings. Its bill is stout and conical with a culmen length of 1.1–1.5 cm (0.43–0.59 in), strongly built as an adaptation for eating seeds. Photo by Bet Zimmerman. The wing chord is 6.7–8.9 cm (2.6–3.5 in), and the tarsus is 1.6–2.5 cm (0.63–0.98 in). Its tail is short, at 5.2–6.5 cm (2.0–2.6 in) long. Notice tunnel like entrance that I do not usually see inside smaller nestboxes. The first large introduction was in 1851 - 1852, 100 birds brought to Brooklyn NY and successfully released. Initially, some of these birds were imported from England hoping to control certain caterpillars that harm shade trees. Eggs will also have brown specks or spots. House Sparrow eggs are sometimes confused with Cowbird eggs, but typically there would be only one Cowbird egg, and the rest would belong to the host. Wingspan ranges from 19–25 centimetres (7.5–9.8 in). The photo below is in a different nest, with the eggs surrounded by feathers. One is unusually dark on the large end. The house sparrow is typically about 16 cm (6.3 in) long, ranging from 14 to 18 cm (5.5 to 7.1 in). House Sparrows Habits. What Do House Sparrow Eggs Look Like? More on cowbirds. House sparrow eggs are small (approximately 0.6 inches in diameter) and range in color from white to gray or can sometimes have a greenish tint.