academic press actinopterygii adaptation adelie penguin aetosaur africa airfoil alan feduccia alaska albatross alpha taxonomy altricial ammonia amphibian anatidae ancient egypt ancient murrelet animal animal communication anseriformes antarctica apodiformes arborea archaeopteryx archosaur archosauromorpha arctic ascidiacea asio auk australian magpie avemetatarsalia avialae avian ecology field methods avian incubation avian influenza avian range expansion aviculture avimimus bacteria bar-tailed godwit barn swallow beak bee hummingbird bilateria binocular vision biochemical journal biodiversity biological classification biology letters bipedalism birdlife international bird anatomy bird collections bird conservation bird evolution bird feeder bird feeding bird flight bird hybrid bird intelligence bird migration bird nest bird ringing bird strike bird vision bird vocalization birdwatching black-browed albatross black-headed duck blindness blue tit body plan borana people brood parasite brood patch bycatch calcium carbonate california california condor camouflage campylobacteriosis caprimulgiformes carboniferous carrion cattle egret catullus cave painting cell nucleus central america cerebellum cerebral hemisphere cerebrum charadriiformes charles sibley chicken chile chimera china chondrichthyes chordate choristodera chronobiology ciconiiformes clade cloaca cochlea coenocorypha columbiformes commensalism common cuckoo common guillemot common poorwill common raven cone cell confuciusornis confuciusornithidae conservation biology constellation contact lens coraciiformes cormorant corvida corvidae craniata creatine creatinine crepuscular cretaceous critically endangered species crocodilia crocodylomorpha crurotarsi cryptosporidiosis cuckoo cuculiformes deity devonian die naturwissenschaften digital object identifier dinosaur dinosaur classification dinosauromorpha dipper diving duck dolphin double-crested cormorant down duck eagle ear easter island ecological niche emperor penguin emu enantiornithes endemism in birds english language erythrosuchidae estrildid finch eumetazoa euparkeria european starling evolution evolutionary radiation ex-situ conservation exaptation extinction falcon falconiformes feather feathered dinosaurs filter feeder finch flamingo fledge flight feather flightless bird flying and gliding animals formic acid fossil fovea francis willughby frigatebird frugivore galah galliformes giardiasis gizzard goose great blue heron great cormorant great frigatebird grebe grouse gruiformes guano gull handbook of the birds of the world hawk helm identification guides helpers at the nest hesperornithes hibernation hoatzin homer honeyguide hoopoe horned owl house sparrow house wren hugin and munin hummingbird humphrey-parkes terminology hyperoartia ichthyornis icterid in-situ conservation india insectivore introduced species invasive species jacques gauthier james clements japan jeholornis john james audubon john ray jon edward ahlquist jonah journal of avian biology journal of zoology jurassic kestrel kidney kimmeridgian kingfisher kiwi kleptoparasitism lake ontario lancelet larry martin larvacea late jurassic late quaternary prehistoric birds liaoning linnaean taxonomy list of birds list of extinct birds list of fictional birds list of fossil birds lists of birds by region longisquama loon lynx edicions mammal maniraptora manx shearwater marine mammal masked booby master of the playing cards mastication megapode melanesia metabolism metatarsus micronesia microraptor mixed-species feeding flock moa mobbing behavior modern birds monk parakeet moult mousebird mughal era muttonbirding mutualism myna national audubon society nectarivore neogene neognathae nervous system neurotoxin new guinea new world vulture new zealand nictitating membrane nightingale nightjar norfolk island green parrot odin odyssey oecologia olfaction online computer library center ordovician origin of birds ornithischia ornithodira ornithology ornithosuchidae ornithothoraces ornithurae ostrich oviraptoridae owl owlet-nightjar oxford university press paleogene paleognathae paleontology palm cockatoo paraves parental investment parrot partridge passerine peacock throne pecten oculi pelecaniformes pelican pelvis penguin permian persian empire petrel phasianidae pheasant photoreceptor cell phylogenetics phytosaur piciformes pigeon racing pitohui plumage polaris polyandry polygamy polygynandry polygyny polynesia poultry precocial princeton university press proceedings of the royal society procellariiformes prolacertiformes promiscuity proterochampsidae proterosuchidae psittacosis pterosaur pygostyle pygostylia quail ratite rauisuchia red-billed quelea red-necked phalarope red kite red lory reptile respiratory system restless flycatcher retina rhynchosaur safety in numbers salmonellosis samuel taylor coleridge sandgrouse sarcopterygii saurischia scandinavia scavenger scleromochlus screamer seabird season septum sexual dimorphism seychelles sunbird shearwater sibley-ahlquist taxonomy silurian skomer skua slow-wave sleep snipe sociable weaver songbird sooty shearwater sorberacea sound south america south polar skua sparrow speciation spider stanford university sternum stomach oil stork sulidae sun sunbird sunbittern swan swift symplesiomorphy synsacrum synthliboramphus systemic circulation tangata manu taxonomic rank temperature-dependent sex determination tern tertiary tetrachromacy tetrapod thaliacea the auk the clements checklist of birds of the world the life of birds the rime of the ancient mariner the stationery office therizinosauridae thermoregulation theropoda threatened species tinamou torpor transitional fossil treecreeper triassic trilophosaur trogon true parrots tuberculosis tuna tunicate turaco ultraviolet urea uric acid urohydrosis uropygial gland varieties of monogamy vegavis vertebral column vertebrate visual field visual system vulture vulture fund wader wales war of the pacific warm-blooded wax wikispecies wing witchcraft woodcock woodpecker woodswallow yellow-headed caracara zw sex-determination system zoological journal of the linnean society zoonosis