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Greater coucal
Greater coucal (Centropus sinensis), also called crow pheasant, a large non-parasitic cuckoo of the Indian Subcontinent and Southeast Asia; black with rusty wings, red eyes, IUCN Least Concern, monogamous nest-builder.
Greater flamingo
Greater flamingo (Phoenicopterus roseus), largest and most widespread flamingo, across Africa, western Asia, southern Europe; shallow-keeled filter feeder of saline wetlands; Least Concern globally.
Greater racket-tailed drongo
Greater racket-tailed drongo (Dicrurus paradiseus), an Asian Dicruridae passerine with racket-tipped tail streamers, 70–125 g, renowned for context-dependent vocal mimicry of other birds' alarm calls; IUCN Least Concern.
Greater roadrunner
Greater roadrunner (Geococcyx californianus, correcaminos grande): a long-legged ground cuckoo of the southwestern US and Mexico, running about 15 mph, eating reptiles and small mammals, population 1.4 million, IUCN Least Concern.
Grebe
Grebes (Podicipediformes, Podicipedidae) are diving waterbirds with lobed toes and rear-set feet, 22 species worldwide, floating nests, feather-eating habits, and loon-like but unrelated loons.
Green peafowl
The green peafowl (Pavo muticus) is a large, endangered pheasant native to the forests of tropical Southeast Asia, larger than the Indian peafowl and showing only slight sexual dimorphism.
Green-cheeked parakeet
Green-cheeked parakeet (Pyrrhura molinae), also called green-cheeked conure, a small South American parrot of Bolivia, Argentina, Paraguay, and Brazil; IUCN Least Concern, decreasing, six subspecies, popular in the pet trade.
Grey heron
Grey heron (Ardea cinerea), also Gray Heron, a large Ardeidae wading bird of Europe, Asia, and Africa; fish-eating, tree-nesting in heronries; IUCN Least Concern with 500,000-2,500,000 mature individuals.
Grey parrot
Grey parrot (Psittacus erithacus), African or Congo grey parrot, an Endangered West and Central African parrot famed for speech-like vocal learning; over 1.3 million wild-caught birds were traded before its 2017 CITES Appendix I listing.
Greylag goose
Greylag goose (Anser anser), a large Palearctic gray goose and ancestor of European domestic geese; two subspecies, wetland nester, Least Concern, UK population 47,000 pairs, sacred to Aphrodite and Juno in classical times.
Grouse
Grouse (Tetraoninae), plump gamebirds of Phasianidae with 19 species in 10 genera, holarctic, feathered tarsi, lekking displays; includes sage-grouse, ptarmigan, capercaillie, prairie-chickens.
Gruidae
Gruidae, the crane family of Gruiformes: 15 species in two subfamilies (Balearicinae crowned cranes, Gruinae true cranes), sister to limpkins and trumpeters, Eocene origin, threatened by habitat loss.
Gruiformes
Gruiformes, an order of birds comprising rails, flufftails, finfoots, trumpeters, cranes, and the limpkin; once a larger artificial assemblage, now reduced by molecular phylogenetics, with Grues confirmed monophyletic but deep placement among Neoaves unresolved.
Grus nigricollis
Grus nigricollis, the black-necked crane (Thrung Thrung Karmo), is the only alpine crane, breeding on the Qinghai-Tibetan Plateau at 2,600-4,900 m and wintering in Yunnan-Guizhou, Tibet, and Bhutan; IUCN Near Threatened, population about 17,400-17,610 and increasing.
Gubernatrix
Gubernatrix is a monotypic tanager genus holding the Yellow Cardinal (Gubernatrix cristata, Cardenal Amarillo), an Endangered South American songbird of 1,000–2,000 mature individuals threatened by cagebird trapping, habitat loss, and hybridization with Diuca diuca.
Gull
Gulls are seabirds of the family Laridae (with terns, noddies, skimmers); 53 species per Pons et al. 2005, ranging from Bonaparte's Gull to Great Black-backed Gull, known for salt glands, shell-dropping cognition, urban adaptation, and aircraft-strike conflicts.
Gulosus
Gulosus, Montagu 1813, is a monotypic cormorant genus holding the European shag, Gulosus aristotelis (formerly Phalacrocorax aristotelis), split from Phalacrocorax after Kennedy and Spencer 2014; coastal seabird, Least Concern.
Gymnasio
Gymnasio (Bonaparte, 1854) is a monotypic owl genus in Strigidae whose sole species, Gymnasio nudipes, the Puerto Rican Owl or múcaro, is endemic to Puerto Rico; Gymnoglaux is its junior synonym.
Gymnoris dentata
Gymnoris dentata, the Sahel Bush Sparrow (formerly Petronia dentata, Bush Petronia), is a 13 cm granivorous Passeridae sparrow of dry acacia woodland in the Sahel and Afrotropics; sedentary, Least Concern, genus Gymnoris distinct from Petronia.
Gyps fulvus
Gyps fulvus, the griffon vulture or Eurasian griffon, is a large 6–11 kg Accipitridae scavenging vulture of Europe, Asia, and Africa that soars on thermals, feeds on large-mammal carrion, nests on cliffs, and is IUCN Least Concern with Spain holding most of the population.
Gyrfalcon
Gyrfalcon (Falco rusticolus), the world's largest falcon, an Arctic circumpolar raptor hunting mainly ptarmigan, nesting on cliffs; IUCN Least Concern, CITES Appendix I, population about 70,000, threatened mainly by climate change.
Haast's eagle
Haast's eagle (Hieraaetus moorei, formerly Harpagornis moorei; Māori pouākai) was New Zealand's extinct giant eagle, the largest known, weighing up to 15 kg, hunting moa, descended from the little eagle, extinct 500–600 years ago.
Habia
Habia (ant-tanagers) is a genus of Neotropical Cardinalidae passerines established by Blyth in 1840, including the Red-crowned, Red-throated, Black-cheeked, Sooty, and Crested ant-tanagers; some classifications move four species to Driophlox.
Haematopus
Haematopus is the genus of oystercatchers, family Haematopodidae, 12 coastal species worldwide that open bivalves with strong bills; includes extinct H. meadewaldoi and rapidly radiating Old World lineages.
Haemorhous
Haemorhous (Swainson, 1837) is a genus of three North American finches in Fringillidae: House Finch, Purple Finch, and Cassin's Finch, formerly placed in Carpodacus and split off after molecular work showed Carpodacus was polyphyletic.
Halcyon
Halcyon (Blue Kingfishers), a genus of 12 Old World tree-kingfisher species in Alcedinidae, subfamily Halcyoninae, established by Swainson 1821; sister to Pelargopsis, once far more broadly circumscribed.
Harpy eagle
Harpy eagle (Harpia harpyja), largest and among the most powerful eagles, a Neotropical rainforest raptor from southern Mexico to northern Argentina, feeding mainly on sloths and primates, Vulnerable, national bird of Panama.
Harrier (bird)
Harrier (bird), genus Circus, about 15 species of Accipitridae hawks hunting low over open ground with V-shaped wings, owl-like facial disks for hearing prey, ground nests; includes Hen, Northern, and Marsh Harriers.
Harris's hawk
Harris's hawk, also known as the bay-winged hawk, is a large bird of prey from the southwestern United States to South America that hunts in family groups.
Hawaiian crow
Hawaiian crow (ʻAlalā, Corvus hawaiiensis), a crow endemic to Hawaiʻi, extinct in the wild since 2002 and the only survivor of five Hawaiian corvid species; over 110 birds exist in San Diego Zoo Wildlife Alliance breeding facilities, with releases on Maui since 2024.