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Great Egret: This large white heron has yellow eyes and a bill that is also yellow but appears orange when breeding, black legs and feet, and long feather plumes that extend from the back to beyond the tail during breeding season. Feeds on fish, frogs, insects, snakes and crayfish. It has a buoyant direct flight on steady wing beats. Sexes are similar in appearance, but males are slightly larger.
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Green Heron: This small heron has gray-green upperparts, chestnut brown head, neck, and upper breast, and a paler brown belly. It has a green-black cap with a small crest and a white throat. The neck has a white central stripe. The bill is two-toned with a dark upper mandible and yellow lower. During the breeding season bill is black. It is an opportunistic feeder with fish as the primary food source. Direct flight. Sexes are similar.
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Gyrfalcon: Large northern falcon with three color morphs: dark, white, and gray. Dark morph is dark gray with pale streaks on throat and upper breast. White morph is white with dark spots and markings on wings, nape, and sides. Gray morph is a mix. The eyes, bill, and legs of all morphs are yellow.
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Golden-crowned Sparrow: Large sparrow, brown-streaked upperparts and plain gray breast. Yellow crown is bordered by a wide black cap; cheek and collar are black. Bill is gray. Wings are brown with two white bars. Short flights, alternates rapid wing beats with brief periods of wings pulled to sides.
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Glaucous Gull: This large white gull has a pale gray back and yellow eyes. The bill is yellow with a red spot on the lower mandible. The wings are white-edged and white tipped; the legs and feet are pink. It is an active predator of seabird nesting colonies. Diet includes fish, insects and birds. It has slow steady wing beats and soars on thermals and updrafts. The sexes are similar.
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Glaucous-winged Gull: This large gull has gray upperparts with white underparts, head and neck. The eyes are dark and the bill is yellow with a red spot on the lower mandible. The wings are gray with white edges and spots near the tips. The legs and feet are pink. It feeds on fish, small birds, or almost anything. It has a powerful direct flight and often soars on thermals. The sexes are similar.
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Golden-winged Warbler: Small warbler with gray upperparts and white underparts. Face is white with black mask and throat, and head has a yellow crown. Wings are gray with large yellow patches. Its flight is weak and fluttering, alternates rapid wing beats with periods of wings drawn to its sides.
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Greater Prairie-Chicke: Medium grouse, barred with brown and buff (or white). Yellow-orange eye combs. Orange air sacs on both sides of the neck inflate during courtship display; long feathers on back of neck also raised during displays. Short, dark brown tail, legs are feathered to the toes.
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Great Crested Flycatcher: Large, crested flycatcher with olive-green upperparts. Head, throat, and upper breast are gray, belly is yellow, and undertail coverts are lemon-yellow. Bill is heavy and black. Wings are dark with rufous patches. Tail is rufous. Swift bouyant direct flight.
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Gray-cheeked Thrush: Small thrush (minimus), with olive-brown upperparts, buff-brown breast with brown spots, and white or buff belly. Gray eye-ring is indistinct. Upper mandible is black with pale base, while lower mandible is yellow with black tip. Tail and rump have rust-brown wash.
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Glossy Ibis: Medium wading bird, iridescent bronze and red-brown overall with thin band of white feathers around bare dark blue face and long, down curved, gray bill. Eyes are dark, legs are yellow-gray. Alternates several shallow rapid wing beats and short glides. Flies in straight line formation.
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Great Black-backed Gull: World's largest gull. White head, black upperparts, white underparts, large yellow bill with red spot on lower mandible, pale-eyed with red orbital ring, pink legs, feet. Flight is direct and powerful with deep, slow wing beats. Soars on thermals or updrafts.
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Greater Scaup: This large diving duck has a glossy green-black head, white sides and belly, black tail, neck and breast, barred gray flanks and back. The eyes are yellow and the bill is blue-gray with a black tip. The diet includes aquatic insects and plants. It has a rapid direct flight with strong, quick wing beats. The female is dull brown with a white patch on the face at base of bill.
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