. The birds of Illinois and Wisconsin. Birds; Birds. ORDER LONGIPENNES. LONG-WINGED SWIMMERS. J^GERS, GULLS, TERNS, ETC. Family STERCORARIID^. The Skuas and JcBgers. special Characters: Nostrils, separate and not tubular; bill, with cere; front toes, palmate (full webbed); hind toe, small, but always present and without web; end of upper mandible (unguis), swollen and somewhat rounded; plumage, always dark, sometimes sooty, sometimes barred with brown; tail, never white or gray; middle tail feathers, longest. The cere, a hard skin-like covering on base of upper mandible, well distinguishes the
. The birds of Illinois and Wisconsin. Birds; Birds. ORDER LONGIPENNES. LONG-WINGED SWIMMERS. J^GERS, GULLS, TERNS, ETC. Family STERCORARIID^. The Skuas and JcBgers. special Characters: Nostrils, separate and not tubular; bill, with cere; front toes, palmate (full webbed); hind toe, small, but always present and without web; end of upper mandible (unguis), swollen and somewhat rounded; plumage, always dark, sometimes sooty, sometimes barred with brown; tail, never white or gray; middle tail feathers, longest. The cere, a hard skin-like covering on base of upper mandible, well distinguishes them from the Please note that these images are extracted from scanned page images that may have been digitally enhanced for readability - coloration and appearance of these illustrations may not perfectly resemble the original Cory, Charles B. (Charles Barney), 1857-1921. Chicago
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Keywords: ., bookauthorcory, bookcentury1900, bookdecade1900, booksubjectbirds
