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A. J. Cook A. O. U. Check List Adult female Adult in summer Adult in winter Adult male axillars belly bill Birds N. E. Birds of Wisconsin Blackburnian Warbler blackish blue breeding buffy white Central America chestnut common summer resident Crown and back dark brown Dendroica Distr Duck dull white dusky eggs following species Genus grayish brown greenish Hawk hind toe Illinois and Wisconsin Immature birds inches long inner webs Kumlien and Hollister Lake Koshkonong Lake Michigan Length less white Linn mandible migrations mottled Nelson nest North America northern northern United olive green outer primaries outer tail feathers pale buff Palm Warbler patch rare Ridgway Rough-legged Hawk rufous brown sides of head south in winter southern Illinois Sparrow specimen spotted streaked with black stripe Subfamily tarsus tawny throat tinged tipped with white upper plumage upper tail coverts Warbler West Indies whitish wing bands wing coverts Wiscon yellow yellowish