Birds are the animals most associated with flight. Because of this, any flying creature--fictional or real--are often given traits like birds. Building nests, singing songs, pecking holes, and so on.

Although birds ''are'' the most numerous of all flying vertebrates in terms of sheer number of species, they are only one group of the numerous creatures that take to the skies. Insects and bats are generally excluded from the All Flyers Are Birds trope, since they still live with us and we know their behavior like it's nothing, but prehistoric and fantasy creatures are still at risk. If you come across anything non-human with wings, expect it to perch on a tree at some point or another, or worse yet, tweet in a bird-like fashion. This may be acceptable in fantasy animals because they are, of course, original creations/species and you can do whatever the hell you want with them, but it's probably not as good an idea to apply this trope to species that really existed (or even worse, species that still do.)

This is a subtrope of AllAnimalsAreDomesticated, and is essentially the airborne version of AllAnimalsAreDogs. For specific examples related to prehistoric life, see PteroSoarer and RaptorAttack (for the case of Archaeopteryx and other early birds). For examples of birds themselves being treated badly, see SomewhereAnOrnithologistIsCrying.



[[folder:Common Examples]]
* Prehistoric creatures in particular are guilty of this, especially [[PteroSoarer pterosaurs.]] It's often the case that they stand on two legs, perch in trees, and construct bird-like nests. While it's debatable whether pterosaurs could climb trees, we do know that they were actually quadrupedal and nested on the ground.
** In a similar manner, ''Archaeopteryx'' and other early bird relatives are depicted as being able to perch on trees. In reality they were more similar to [[RaptorAttack non-avian deinonychosaurs]], and were most likely ground-dwellers which could only glide for limited periods of time.
* On the mythology side of things, Wyverns (a type of dragon, or dragon-like creature) are often depicted as having birdlike proportions and mannerisms, due to their decidedly avian body plan (two legs and two large wings). For example, you can often expect them to fill the role of KidnappingBirdOfPrey if no other mythological winged monsters are available.
** Griffons tend to be depicted more like birds than lions, despite being half and half. Probably justified because their heads are mostly birdlike (which would imply a bird's brain) but depicting an animal with the hindquarters of a placental mammal ''laying eggs'' is fairly confusing.

[[folder:Films -- Animated]]
* In ''WesternAnimation/HowToTrainYourDragon'', the Deadly Nadder is the most bird-like of all dragons. It walks on two legs in a rather bird-like or dinosaur-like manner, preens its scales, makes bird-like squawks and warbles on occasion, and turns its head to the side when it looks at you, in a rather similar fashion to the songbirds who hunt worms in your everyday garden.
** Averted by other dragons, though. Toothless in particular incorporates behaviors of big cats and ''horses''.
* The [=RatBirds=] from ''WesternAnimation/CloudyWithAChanceOfMeatballs'' tend to behave like actual birds, though with some rat-like tendencies.

[[folder:Films -- Live-Action]]
* The ''Pteranodons'' from ''Film/JurassicParkIII'' nest in a very bird-like way, [[ScienceMarchesOn although the current paleontological evidence]] [[ArtisticLicensePaleontology certainly says otherwise.]]
** Played with in ''Film/JurassicWorld''. The ''Pteranodons'' have grasping talons and jump to launch rather than vaulting with their wings. They also dive like gannets, but this quality is actually [[ShownTheirWork accurate]] to what real ''Pteranodons'' were capable of (indeed, it's believed to have been their main hunting method).
* Creator/RayHarryhausen's ''Film/OneMillionYearsBC'' has pterosaurs with eagle-like talons. Again, the ''Pteranodon'' also has a bird-like nest, complete with oversized ''Pteranodon'' babies.
* In ''Film/TheFlintstonesInVivaRockVegas'', a pterodactyl bores through wood like a woodpecker.
* Film/{{Rodan}} in many of its appearances exhibits several examples. It perches like a bird, it builds a nest, it lays outsized eggs, and it can grasp things (such as dolphins) in its talons. Considering Rodan is a fictional movie monster, the filmmakers weren't likely going for realism.
* Done in-universe in ''Film/IndianaJonesAndTheTempleOfDoom''. Willie Scott, [[FishOutOfWater an]] ''[[FishOutOfWater extremely]]'' [[FishOutOfWater naïve Midwesterner]] who has apparently never been anywhere else other than Shanghai (where she performs her nightclub act), is riding an elephant through the Indian forest with Indiana and Short Round. She points out some "big birds" flying overhead - and Indy informs her that those aren't "big birds", but bats. (Especially absurd because there are ''several'' species of bats in Willie's native Missouri.)
** The bats are flying foxes, tho, which are huge and nothing like the bats she would've known about back in the States. For someone who has no idea of the flying foxes' existence, it is perfectly understandable to mistake them for birds at first glance, especially because they were flying overhead in broad daylight.

[[folder:Live-Action TV]]
* The ''Anurognathus'' from ''Series/{{Primeval}}'' perch in the trees like birds do.
* ''Anurognathus'' also shows up in ''Series/WalkingWithDinosaurs'' as a symbiote of ''Diplodocus'', intentionally following it and feeding on the insects living on its skin in the manner of modern birds like oxpeckers and cattle egrets. There is no basis for this, and in fact ''Diplodocus'' and ''Anurognathus'' lived in different continents (although a close relative of ''Anurognathus'', ''Mesadactylus'', did live in the same place as ''Diplodocus'')
** [[ScienceMarchesOn Research done since the release of "Walking With Dinosaurs"]] suggests that ''Anurognathus'' was nocturnal and caught insects while flying. Interestingly, that's ''still'' an example of this trope, as the same behavior is exhibited by modern birds like the nightjar.
* Barney on ''Series/TheAndyGriffithShow'' believed bats laid eggs.

* [[Literature/TheBible The Bible]] says bats are birds in Leviticus 11:13-19:
-->''These are the '''birds''' you are to regard as unclean and not eat because they are unclean: the eagle, the vulture, the black vulture, 14 the red kite, any kind of black kite, 15 any kind of raven, 16 the horned owl, the screech owl, the gull, any kind of hawk, 17 the little owl, the cormorant, the great owl, 18 the white owl, the desert owl, the osprey, 19 the stork, any kind of heron, the hoopoe and the '''bat'''.
** Arguably this is likely a translation error, with the native word for bird referring to any winged flying creature, much like Jonah being swallowed by a "great fish" (more likely a whale because the word for fish was any swimmer, though some scholars believe it was meant to be a shark).

* A lot of Flying-type Franchise/{{Pokemon}} that have a bird-like body shape behave in a sort of avian fashion. Aerodactyl, for example, is often seen standing on two legs and carrying things in its talons like a bird of prey. A few bird Pokemon invert this trope, though, such as the flightless Doduo and Dodrio.
** Even the [[GoddamnBats Zubat]] family can learn moves named for or associated with birds, such as Brave Bird and Sky Attack (in Japanese: "Godbird"). Woobat, however, averts this.
** The animation for Wing Attack shows feathers flying after the opponent is struck, even though Pokemon that can learn this attack include those that are based on bats, pterosaurs, dragons, dragonflies, mantises, ''manta rays''...
** The logic behind Flying-types being strong against Bug-types seems to be "birds eat bugs". That said, this can still be justified with creatures like Zubat, Aerodactyl and Scyther as there are indeed species of bats, pterosaurs and flying insects that [[TruthInTelevision eat bugs as well]] (though a pterosaur as large as Aerodactyl would probably prefer more substantial prey). Less justified when you consider that the aforementioned dragons and manta rays share this advantage.
** Inverted with Lugia who is supposed to be some sort of bird-monster, but looks more like a dragon and doesn't act very bird-like at all (It sleeps in a cave at the bottom of the ocean rather than in a nest). Even the games point this out.
** It appears that the Flying type was originally going to be called Bird, and ''all'' bird-based Pokemon in Generation 1 were classified in it, whether they could fly or not. The reason Psyduck isn't is because it isn't based on a duck, but on a platypus.
** Altaria is a inversion of this trope. It's a bird, but it's a ''Dragon'' type. When it mega evolves, it becomes Dragon/Fairy, while still remaining a bird. All that changes is it get more clouds and its tail grows longer.
* ''VideoGame/Spyro2RiptosRage'' has "pterodactyls" that look like birds, grasp like birds, and make hawk-like noises.
* Occurs only in writing in ''VideoGame/TalesOfSymphonia'', where, presumably for simplicity, creatures such as bats are classified as birds in the bestiary.
* In ''VideoGame/StarControlII'' the Yehat have particularly bird-like mannerisms, and call themselves birds, despite clearly resembling either dragons or pterosaurs of some sort. Despite this, they are not earth animals at all, and are aliens. Their original dialog, before the 3DO version, and later the PC port The Ur-Quan Masters added voice, even had them squawking and making other various bird noises. This was replaced with a Scottish accent in the voiced editions.
** The Yehat subspecies, the Pkunk are also bird-like aliens, and have similar mannerisms, though, they do not possess the ability to fly like the Yehat (presumably) do.

[[folder:Web Original]]
* ''WebOriginal/{{Mortasheen}}'' actually inverts this trope. Most of the birdlike monsters there don't behave like real birds at all, and the one monster that is claimed to actually make a bird-like song [[ doesn't even look like a bird at all!]]

[[folder:Western Animation]]
* A fair few of the MixAndMatchCritters of ''WesternAnimation/AvatarTheLastAirbender'' are partially based on birds, and so have bird-like mannerisms. The ostrich-horses are an exception, though, [[HorseOfADifferentColor because their behavior is a lot more equine.]]
* ''ImADinosaur'' has feathered, bipedal pterosaurs that live in trees.
* The Disney short ''The Flying Squirrel'' features a flying squirrel. While it doesn't flap its arms in imitation of a bird, its flight movements are birdlike in every other way. It can move up and down and a couple of times it even ''hovers''.

* Early classification systems classified bats as birds.
** Bees seem to have been subject to this as well
* Many pterosaurs in real life did in fact fill specific niches similar to those of modern birds. The [[StockDinosaurs famous]] ''Pteranodon'' fed like a pelican, diving into the water and snatching fish up in its beak. ''Rhamphorhynchus'' fed much like a seagull. ''Pterodactylus'' was a wader/prober like a shorebird. ''Pterodaustro'' filter fed like a flamingo. The [[GiantFlyer giant]] ''Quetzalcoatlus'' was basically a massive marabou stork in behavior, picking up small animals with its long beak while walking around and swallowing them whole. ''Harpactognathus'' hunted like an eagle. ''Istiodactylus'' scavenged like a vulture. ''Anurognathus'' and its ilk were nocturnal aerial insectivores like nightjars (and bats). ''Tapejara'' and ''Tupandactylus'' may have been omnivorous fruit-eaters like hornbills. Indeed, some scientists believe that birds developed the diversity they have now to fill the niches left behind by pterosaurs after they went extinct (though this is somewhat controversial).
* If you want to have some fun with cladistics and define "bird" as everything that is closer related to modern birds than to modern crocodiles (the most liberal possible definition; this clade is currently called Avemetatarsalia or Pan-Aves, although Ornithosuchia was used prior to 1990), then that would indeed include the pterosaurs. But it would also include all dinosaurs, of which most [[note]]of the ''non''-Avian dinosaurs, because modern birds are dinosaurs too[[/note]] definitely could ''not'' fly.