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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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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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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 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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Greater Scaup: Large diving duck with glossy green-black head, white sides and belly, black tail, neck and breast, barred gray flanks and back. Eyes are yellow. Bill is blue-gray with a black tip. Feeds on insects, plants, vertebrates and mollusks. Rapid direct flight with strong rapid wing beats.
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Gray Hawk: Small tropical hawk with uniformly pale gray upperparts and fine white barring on underparts. Cere is yellow. Tail is thickly banded black and white. Wing tips are rounded. Legs and feet are yellow. Bouyant, graceful flap-and-glide flight, soars on thermals often but not to great heights.
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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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Gunnison Sage-Grouse: Recognized as a species in 2000. Large grouse, mottled gray-brown overall with white breast, black face, chin, throat, bib and belly. Black bill. Yellow eye combs and long black filoplumes on neck show when courting. Brown tail feathers are long and pointed, with white bands.
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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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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 Gray Owl: Large owl, dark gray body interspersed with bars and flecks of brown, pale gray, and white. Head is large and without ear tufts. Yellow eyes are relatively small. Bulky appearance when perching due to dense, fluffy plumage, long wings extending past body, and relatively long tail.
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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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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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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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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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Glaucous Gull: Large, white gull with pale gray back. Eyes are yellow. Bill is yellow with red spot on lower mandible. Wings are white-edged and white tipped. Legs and feet are pink. An active predator of seabird nesting colonies. Slow, steady wing beats. Soars on thermals and updrafts.
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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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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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