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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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Gray Catbird: Small, shy, dark gray mockingbird with black cap and red-brown undertail coverts. The bill, legs, and feet are black. Forages on ground, shrubs and branches. Feeds mostly on insects and their larvae, spiders, berries and fruits. Swift direct flight on rapid wing beats.
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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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Greater Shearwater: Large shearwater, scaled, gray-brown upperparts, white underparts, brown markings on belly. Dark cap contrasts with white face. Tail is dark above with conspicuous white rump band and gray below. Dark, hooked bill. Pink legs, feet. Flies on deep wing beats followed by long glide.
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Great-winged Petrel: Large petrel with brown-black body except for pale gray forehead, face, chin, and throat. Bill is black and stout. The legs and feet are black. Feed on fish, squid and crustaceans. In New Zealand it is also known by its Maori name oi and as a muttonbird. AKA Grey-faced Petrel.
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Green Sandpiper: Medium sandpiper with pale-spotted, dark gray-brown back and rump, white underparts with dark streaks on neck, upper breast, sides. Head is dark and eye-ring is white. Tail is white with fine dark spotting at tip. Bill, legs, feet are olive-green. Swift flight with rapid wing beats.
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Gray-crowned Yellowthroat: Large warbler rarly seen in the U.S. Upperparts are olive-brown to olive-gray with a grayer head, distinctive black mark between bill and eyes, and broken white eye-ring. The upper mandible is black and lower mandible is pink. Underparts are yellow with gray wash on sides.
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Gray Partridge: Gray-brown ground bird with rufous face and throat. Body complexly barred and streaked with red and white. Dark red belly patch. Legs and feet are yellow-orange. Prefers to walk rather than fly. Introduced to North America as a game bird in the early 1900s. AKA Hungarian Partridge.
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Great Skua: Large, heavy-bodied seabird, prominent white patch in primary feathers. Body color ranges from a light bleached to dark brown, all have a cinammon wash that makes the bird look red-tinged. Strong direct flight with constant shallow wingbeats. Hugs wave contours or flies up to 150 feet.
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Gray-headed Chickadee: Medium chickadee with gray-brown back, gray cap, black bib, white cheeks, and white underparts washed with buff-gray on sides and flanks. Wings and tail are gray with white-edged feathers. Formerly called the Siberian Tit, it is the hardiest of all chickadees.
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Gray Vireo: Medium-sized vireo with gray upperparts, faint white spectacles, dark iris, and dull white underparts. The wings are dark gray with indistinct white bars. The sideways twitching of the tail is unique among vireos and is similar to gnatcatchers. Forages in low undergrowth.
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Gambel's Quail: Medium quail, gray upperparts and breast, scaled gray nape, black patch on center of abdomen, black head plume, white-bordered black face, cinnamon-brown crown, buff underparts, flanks streaked dark chestnut-brown and white. Alternates several stiff wing beats with short glides.
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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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Gray-streaked Flycatcher: Small flycatcher with gray-brown upperparts and dark streaked white underparts. Tail is short and notched; wings are gray-brown with faint white wing bar. Undertail coverts are white. Face shows white eye-ring and distinct brown malar mark; throat is white. Bill is black.
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Gilded Flicker: Large woodpecker with dark barred and spotted brown back, brown cap, pale gray face and throat, red moustache stripe, white rump, thick black crescent on upper breast, and black spotted, pale buff underparts. It was named for the gold color of its underwings and tail.
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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-winged Gull: Large gull with gray upperparts and white underparts, head, and neck. Eyes are dark. Bill is yellow with red spot on lower mandible. Wings are gray with white edges and spots near the tips. Legs and feet are pink. Powerful direct flight, often soars on thermals.
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Golden Eagle: Large raptor with dark brown body and golden-brown feathers on back of head and nape. Eyes and bill are dark. Cere is yellow. Legs are completely feathered. Feet are yellow. Alternates deep slow wing beats with glides, soars on thermals. Has been clocked in a steep glide at 120 mph.
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Green Heron: Small heron with gray-green upperparts. Head, neck, upper breast are chestnut-brown, belly is paler brown. Head has green-black cap with small crest. Throat is white and neck has white central stripe. Bill is two-toned with dark upper mandible and yellow lower mandible. Direct flight.
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Great Horned Owl: Large owl with dark brown, gray-brown mottled upperparts and dark barred underparts. Head has distinct ear tufts and rufous facial disk. Throat and upper breast are white and may have dark spots. Northern birds are paler and grayer. Strong, silent, direct, flap and glide flight.
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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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Gadwall: Large dabbling duck with finely barred gray body, black rump and undertail coverts, white belly, and rust-brown shoulders. Head and neck are gray-brown; bill is gray. Wings have black-bordered white speculum most visible in flight. Legs and feet are yellow. Fast direct flight.
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Garganey: Small dabbling duck with black-streaked, gray upperparts, chestnut-brown mottled face and breast, pale gray flanks. White stripe above eye, running down neck is highly visible. Wings have pale blue shoulder patches and dark green speculum with white borders visible in flight.
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Grasshopper Sparrow: Medium sparrow with brown-streaked upperparts and white underparts. Face, flanks, and breast are plain buff-brown. Head is flat with central white stripe though dark crown. Upper mandible is gray, while lower mandible is yellow. Pink legs and feet. Named for its insectlike song.
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Greater Yellowlegs: Large sandpiper with mottled brown, gray, and white upperparts. Underparts are white with dark streaks, spots. Bill is slightly upturned. Legs are long and bright yellow. Long barred tail and white rump are conspicuous in flight. Swift direct flight, sometimes at great heights.
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Greater Sage Grouse: Largest North American grouse, has scaled gray-brown upperparts, white breast, black throat, bib, and belly, and yellow combs above eyes. Large, white collar-like patch on breast conceals two yellow air sacs displayed during courtship. Tail feathers are long and pointed.
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Green-winged Teal: Small dabbling duck with pale, gray-barred sides and buff breast with a white bar down the side. Head is chestnut-brown with green ear patch. Bill is dark gray and legs and feet are olive-gray to gray-brown. Speculum is flashy green bordered with brown above and white below.
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Greater White-fronted Goose: Medium goose with dark-brown body. Underparts are barred and flecked with black; belly and undertail coverts are conspicuously white. Front of face has a white patch. Bill is usually pink. Legs are orange. Steady direct flight with rapid wing beats. Flies in V formation.
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Greater Roadrunner: Large, ground-dwelling cuckoo with overall brown, white and buff streaked appearance. Head has a shaggy crest. Face has blue and orange bare patch of skin behind eyes. Tail is long. Eats insects, lizards, snakes, rodents, small birds and fruits and seeds. Can run up to 15 mph.
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Gray-crowned Rosy-Finch: Medium finch with brown body and pink on shoulders, flanks, and belly. Forehead is dark brown. The black bill turns yellow with a dark tip in the winter. Back of head and belly have gray patches. Forages in bushes, trees and on ground for seeds and insects. Bounding flight.
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