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Adult downy woodpeckers are the smallest of North America's woodpeckers, but there are many smaller species elsewhere, especially the piculets. The total length of the species ranges from 14 to 18 cm (5.5 to 7.1 in) and the wingspan from 25 to 31 cm (9.8 to 12.2 in). Body mass ranges from 20 to 33 g (0.71 to 1.16 oz). Standard measurements are as follows: the wing chord is 8.5–10 cm (3.3–3.9 in), the tail is 4–6 cm (1.6–2.4 in), the bill is 1–1.8 cm (0.39–0.71 in) and the tarsus is 1.1–1.7 cm (0.43–0.67 in). The downy woodpecker is mainly black on the upperparts and wings, with a white back, throat and belly and white spotting on the wings. There is one white bar above the eye, and one below. They have a black tail with white outer feathers barred with black. Adult males have a red patch on the back of the head whereas juvenile birds display a red cap. The downy woodpecker is virtually identical in plumage pattern to the larger hairy woodpecker, but it can be distinguished from the hairy by the presence of black spots on its white tail feathers and the length of its bill. The downy woodpecker's bill is shorter than its head, whereas the hairy woodpecker's bill is approximately equal to head length.
West Ridge Nature Park in the heart of Chicago's northside, about a mile west of Lake Michigan. Large pond, surrounded by restored prairie/shrubland and forest, adjacent to a large, old cemetery.