T O P
skyguy2002

Vultures have the strongest stomach acid of any animal of earth. Not only can they digest bones but it prevents them getting sick when they eat rotting corpses. Because of this Vultures play a vital role in the ecosystem by eating carcasses and preventing disease from spreading


Zemykitty

Other scavengers like hyenas, jackals, etc also watch the sky for vultures. If vultures start circling the scavengers know to head in that direction because something is dead. Cheetahs hate it as they are often solitary (not 100% as male coalitions of brothers can form) and scare easily.


314159265358979326

Vultures in India played a vital role in preventing rabies. When vultures eat a corpse, rabies goes away. When wild dogs eat a corpse, rabies spreads. In the late 1990's, India legalized veterinary use of diclofenac, a drug similar to Advil. Over the next few years, because this chemical is incredibly lethal to old world vultures, vulture populations plummeted by around 99%. Because of this, wild dogs took over carrion disposal and rabies went rampant, now costing India billions of dollars per year.


Ron0hh

This is also a huge issue for Zoroastrians since their death ritual involves carrion birds, like vultures, eating the dead bodies. The large Zoroastrian population in Mumbai is look at how to follow their beliefs without letting the bodies pile up.


RickDoesntCare

Thanks for the bird fact 😊🤗


lordlollygag

To add- a defense mechanism of theirs is the smell of their vomit, which is extra foul to ward of threatening predators.


No-Cardiologist-605

Vultures also pee on their legs to keep cool


DnDanbrose

Vultures are like the opposite of flamingoes


TheRavenSayeth

Flamingos poop on their wings to keep warm?


ShadyMerchant92

Vultures blood is so acidic that rabies can't survive in them


TimeCrab3000

Only mammals can carry rabies.


Faster_Than_Snakes

Flamingoes are pink because of their diet


RickDoesntCare

That's so cool! Thanks for the bird fact 😊


CalendarGreedy3044

Yeah they have reported a black flamingo in a herd of pink ones


donteatmenooo

They are also extremophiles!


Dinkerdoo

Seeing wild flocks of flamingos in the high-altitude lagoons of the Bolivian altiplano was a neat surprise.


TraceFinder

Swifts spend most of their lives flying. They eat and drink and mate in the air, they can even SLEEP while flying. The only time they truly come to the ground is for nesting.


RickDoesntCare

That's wild! Tysm for the bird fact


Basic_Department_302

Name doesn’t check out


Bottle_Nachos

wow what a cool bird!


RichardLiquor69

Well, she does tour a lot.


TheRavenSayeth

Talk about the mile high club


menjirib

Owls cannot swivel their eyes. Instead they move their heads completely around to see straight behind them.


Hum_baba_

Also, some cultures say they keep the souls of the dead. That big patch of fuzz stretching out from its eyes? The souls of the dead clawing for escape


PaniqueAttaque

Owl eyes are roughly tube-shaped instead of spherical. All that extra eye gives them better (night) vision, but prevents their eyes from moving up/down or side-to-side. This is why owls evolved the ability to turn their heads so far around; so they can look at things without having to reposition their whole body.


lesbunner

Owls are weird


Barrrrrrnd

That is also a bird fact.


[deleted]

I think that's true for all birds. The part about not being to swivel their eyes, that is. Most birds have eyes that point further to the side, so the two eyes together cover a large field of view. Owls have forward-facing eyes, so they have to swivel their heads further to see around them.


FuzzyBlanketThrow

Crows can remember and recognize people.


Grenedle

It goes farther than that. I read in a book about a study conducted by catching and tagging crows. The crow catcher had to wear a mask so that birds wouldn't recognize them and attack (although they did attack the person whenever they were wearing the mask). During the study, the preformed a test where they had the person wear the mask flipped upside-down. The crows proceeded to fly upside down to get a better look at the mask and verify that it was the same person.


RavioliGale

In Boston, 2003, there was a sudden influx in crow deaths. Locals were worried about a new strain of bird flu and called in some experts. It was soon obvious, from the crushed bodies and proximity to roads that all the dead crows were victims of vehicular collisions. Nevertheless, concerned about the sudden increase, the bodies were shipped to labs for further study. It was soon discovered (this is where it gets interesting), that based on the paint samples left on the crows that they were only being hit by trucks, never by cars. None of the ornithologists could produce a satisfactory hypothesis. Trucks were louder and should be easier to avoid right? So they set up cameras in places where the most deaths happened. As happens in many cases, the crows were converging to feed on roadkill. Being smart as they are the crows had established a lookout system where one crow would warn the others when a car approached so they wouldn't become roadkill in turn. The issue was that the Boston crow lookout never warned the others about the incoming trucks, he could only shout, "Caw."


Kwauhn

Goddamnit.


Sockbasher

Son of a bitch


thejak32

Fuck you, that was as good as a u/shittymorph post. Take the free award and kindly fuck off.


triscuitsrule

My third grade teacher was wrong that female birds are boring colors and that male birds to all the attracting. Birds see in ultraviolet light and female birds look, to other birds, exceptionally more colorful and amazing than they do to us.


BlueComet24

And phalaropes are reversed, where the females are brighter colors than the males.


[deleted]

Geese sometimes fly upside down when they need to descend rapidly. It's called "whiffling."


RickDoesntCare

Thanks for the bird fact 😄


[deleted]

Fairy-wrens sing to their eggs to teach a secret "password." If a newly hatched chick doesn't sing back the password, the mother knows it's a cuckoo chick and knows not to feed it.


JayGold

Funny that they'd evolve such a complex method to identify cuckoos instead of just being able to tell what their own children are supposed to look like.


RickDoesntCare

Some Birds are so smart lol


Back2Bach

Female cuckoo birds lay their eggs in the nests of other birds, and when the egg hatches, the young cuckoo pushes all of the other eggs out of the nest. The foster parents then raise the cuckoo as their own, often to the detriment of their own offspring.


yamamanama

Cowbirds do that too, but they don't care about how similar the eggs look to their host. They just monitor them and if the other birds remove the eggs, they trash the nests Mafia-style.


Ollie10212

My bird fact is that I'm so glad the blue-footed booby exists, it's such a funny looking birb


notthesedays

And a funny bird name.


Maelstrom_Witch

What about tits?


gabe_t_wheeler

Ravens and wolves have a sort of partnership type thing, so ravens act as a sort of scout for wolves while hunting, when the ravens find an animal, dead or alive, they do a sort of call to alert the wolves of the animals location, then the wolves kill the animal, if its not dead already, eat what they need to eat and leave the rest for the ravens.


Kra_gl_e

This is the most metal bird fact I've ever read.


recidivx

The UK has more penguins than any other country (source: [RSPB](https://www.rspb.org.uk/about-the-rspb/about-us/how-the-rspb-is-run/annual-review/nature-conservation/our-work-in-the-overseas-territories/)).


No-Cardiologist-605

Before the 1800s Europeans did not know that bird migration existed. They thought birds turned into vermin during the winter, flew to the moon, or hibernated in the mud under lakes. In 1822 some villagers in Germany shot down a stork that was impaled by an African spear, which led to naturalists figuring out that birds do in fact migrate to warmer climates during the winter


RickDoesntCare

That must've been surreal


LJack49

Some birds species sleep while they fly, half of their brain sleeps first and the other half later, that way a part of their brain can remain active to control their flight


RickDoesntCare

Thanks for elaborationg on this. Someone else posted that they could fly in their sleep and I couldn't figure out how.


Helpful-Bandicoot-6

I think this is how I work.


RecentExtension1470

Same for dolphins


Devo1277

the birds of the sea.


sharrrper

There is an island near the Falklands that has become a sort of defacto penguin sanctuary. It was covered in land mines during the brief war in the 80s but it's not valuable enough territory now for anyone to bother with trying to de-mine it. Penguins aren't heavy enough to set the mines off so they can move about freely and no humans go there to bother them because, well, mines.


RickDoesntCare

That's really cool, is It like partially run by humans or is it just a completely independent ecosystem?


sharrrper

The impression I got from what I recall about it was it was basically just abandoned at this point, but I'm not certain of the details.


Living_Murphys_Law

If you put two ostriches next to each other, their combined mass would be roughly twice that of an ostrich.


RickDoesntCare

2 ostrich/football field


jewishgamergirl

Australia lost a war to emus


LJack49

Are there really many emus there?


Industrial_Laundry

Around 700k


BizarroCullen

/r/emuwarflashbacks


RickDoesntCare

Didn't China lose a bird war as well lol


RavioliGale

I don't know about that. But they did enact a nationwide campaign to eradicate sparrows that were eating their crop seeds. They were successful. However, the sparrows were also eating insects that are crops. So without the sparrows huge swarms of insects annihilated the harvests and resulted in famine.


RickDoesntCare

I have a cool little fact about that. The emperor at the time decided to pay a small reward for anybody who turned in a dead sparrow. As a result of this, farmers began breeding the sparrows for a harvest and some people made this their whole job. It's one of my favorite loopholes ever.


RavioliGale

I've heard of similar things all over. Crazy how long it takes for the government to learn.


notthesedays

I've heard of people doing the same kind of thing with rats.


BlueComet24

Nuthatches have long rear toes, enabling them to hop down trees. This way they can find food that other birds miss.


Laika72

Kiwis eggs are the largest birds eggs compared to body size, it takes up 20% of its mothers body, it's the equivalent of a human giving birth to a 3 year old child.


slytherinprolly

Certain birds have incredibly fast metabolisms and as a result basically just eat all day long, and they eat a lot. For example the Golden Crowned Kinglet eats about three times its body-weight worth of insects each day. For the average sized person that is the equivalent of about 27 large pizzas in a single day.


RickDoesntCare

A simple life


gotbetterbro

In the continental U.S. alone, between 1.4 billion and 3.7 billion birds are killed by cats annually this stat is actually sad cause birds are very important creatures in circle of life


gonegonegoneaway211

I always remember that one story of an island lighthouse keeper whose cat brought him a dead bird. Now, the man must've been an amateur ornithologist because instead of saying "thanks but ew" and disposing of the bird like the rest of us would've, he brought it to an ornithologist friend of his who excitedly confirmed that it was a brand-new species and went to the island to investigate. ~~The cat had killed all the birds. All of them.~~ Well, that cat and her kittens killed them all. There are only three stuffed specimens left tucked away in a museum somewhere and the bird seems to have been endemic to the island because it's never been found elsewhere. ~~That one damned cat drove a whole species extinct.~~ EDIT: Fact check, several cats.


petite-acorn

The Central Park Effect. So this is really cool! Twice a year, Central Park in Manhattan becomes the birding (aka bird-watching) center of the world for a few weeks. Birds on their migratory path from as far away as South America travel up and down the eastern seaboard as part of their mating and life cycle. When traveling over the eastern United States, these birds are looking down over an endless stretch of urban sprawl that starts in earnest in D.C., and has only a few green gaps until it rips past NYC. And then you fly over Central Park in Manhattan and there's this HUGE greenspace, so why not swoop down and chill for a little while? And that's exactly what happens. Bird enthusiasts rush to Central Park twice a year to see birds just passing through that might otherwise require a trip to Cuba or Panama or Guatemala (etc). There's a really interesting and fun irony to one of the densest urban environments in the world being home to some of the best bird watching on the planet at a couple specific times a year, but there you have it.


RickDoesntCare

That's super cool!


PearlStreetBlues

The common city pigeon you can find pretty much anywhere in the world is not a wild animal. They are feral, because they are descended from domesticated pigeons that either escaped or were set loose. If you could catch a pigeon then with a little food and kindness you could make it love you the same way you could tame a stray cat.


RickDoesntCare

Isn't it crazy that pigeons came before cities?


Lachtaube

The official bird of the city of Madison, WI is the plastic pink flamingo. Like, lawn ornaments.


Spodson

The titmouse is neither a tit or a mouse.


Flimsy-Preparation85

Crows are extremely smart, and if you are nice to them they will be nice to you and bring you gifts.


RickDoesntCare

Yay! Half of a dead mouse!


OneGreenSlug

Unlike mammals, birds don’t experience the “burning” effect of capsaicin, and as a result can eat the even hottest peppers without batting an eye.


WakingOwl1

That’s why they’ll treat bird seed and suet with hot peppers to deter squirrels.


OneGreenSlug

Whoa that’s awesome! Hadn’t even heard about that


thalassarche

Birds are the preferred dispersal agent for pepper seeds, because if they eat pepper seeds they'll pass through their relatively short gut essentially unharmed and the bird will poop the seeds out probably far from the parent plant with a handy dose of fertilizer to boot. Mammals' guts are longer, and mammals are more likely to stay relatively close to the parent plant, so because that's less than ideal, peppers developed chemical warfare to deter the mammals, while being visually appealing to birds, since they lack the receptors that attach capsaicin to the burning sensation mammals experience. And then some upright apes came along and said, "Wow, this hurts to eat. That's kind of fun. Maybe we can do an agriculture and make them hurt even more, and that would be more fun."


RedundantSwine

Eagles normally have two chicks. One is quite literally a back-up plan, and if the one born first is strongest, it will often kill the younger one. In Golden Eagles the younger chick only has a 20% chance of survival. Source: https://www.rspb.org.uk/birds-and-wildlife/wildlife-guides/bird-a-z/golden-eagle/habitat-breeding-and-nesting-habits/ Nature is a brutal place.


RickDoesntCare

Reading that made me really sad


RedundantSwine

Rickdoescare


RickDoesntCare

No I DONT 🤬🤬🤬🤬😡😡🤬


ViciousEspeon

Ravens can mimic human voices better than parrots can.


bloodstained_goose

Eagles are used by police to take down illegal drones


NormalHuman17

My favorite bird fact is that they can fly. I think it's amazing that they can use their wings to lift themselves into the air and stay there. It's like they have their own built-in airplane.


RickDoesntCare

It's some really advanced technology that's for sure


Zabe60

Yet quite often they choose to walk.


notthesedays

Most of them, anyway.


Creative_Recover

There once used to exist a giant eagle in New Zealand which had a wingspan of 10ft across. This colossal eagle (called "Haarst's Eagle", or Hieraaetus Moorei) used to predate on the variety of giant elephant birds such as the Moa (which were big ground birds that looked not unlike Rheas today except stockier) that also used to exist on the island. The giant eagle lived up until as recently as 800 years ago and is thought to have gone extinct after the arrival of human drove (directly or indirectly) its prey to extinction.


Obvious_Swordfish_36

The ducks at the Park are free. You can take them if you like. I have 20 in my backyard.


RickDoesntCare

They don't want you to know it, but it's true! 🤓


Monorail_Song

No they're not. Migratory Bird Act.


Eagle_1776

those feral Muscovys aren't flying anywhere


Comrade_Coby

The government drone technology is unbelievable these days


RickDoesntCare

r/birdsarentreal


neohylanmay

Pigeons sing in [5/4](https://freesound.org/people/dobroide/sounds/27931/) and [17/8](https://freesound.org/people/squashy555/sounds/319512/) time signature.


RickDoesntCare

Those are bad time signatures


nobodywilleverkno

Early birds may get the worm, but night owls get both in one feast.


Competitive-Peanut79

Early bird gets the worm, but the second mouse gets the cheese


IAmFatAlbert

Falcons can fly at 240mph


b-minus

Crows can memorize human faces. If you mess with a crow, it will teach it’s friends that you are a danger and all it’s crow buddies will try to fuck you up when they see you.


[deleted]

Some birds can sleep half a brain at a time. One half of the brain stays awake, looking out for predators through one eye, while the other half sleeps. It's called "unihemispheric slow wave sleep."


RickDoesntCare

Dolphins can do this too I think


blackday44

Birds are the descendants of dinosaurs.


lemongrabsme

penguins can jump as high as 9 feet in the air


OrthinologistSupreme

Did someone say birds 👀 Their respiratory system is wild. We breathe in and out from our lungs but birds have unidirectional lungs. They breatge into air sacs that dont do gas exchange. The next breath in pushes the first along and eventually over their lungs where they exchange gases. It exits into more air sacs until it gets pushed back out as an exhale. Using several air sacs allows for constant air flow over the exchange surfaces. This lets them take in way more oxygen to fuel flight muscles vs our brief pauses to exhale


dizzykitty

Corvids exist and I love them.


slytherinprolly

One of Aesop's Fables, *The Crow and The Pitcher*, involves a crow putting rocks into a pitcher until the water level is high enough to drink from it. This "fable" has been confirmed in lab conditions, not only do corvids recognize water displacement, and that by putting objects in a pitcher the water level rises, but they also start putting smaller rocks into the pitcher as the water level rises and gets closer to the top.


RickDoesntCare

Woah that really puts into perspective how smart they are


Trick-Accident777

Parakeets - males have a blue nose


[deleted]

That a gathering of crows is a murder and a gathering of owls is a parliament.


TheBlackTemplar125

Crows and Ravens are as intelligent as a 7 year old


MickSturbs

Pigeons are one of the few birds that can suck water and drink with their heads down. Most birds have to scoop water and tilt their heads back.


Gupoochamois69

It’s mourning dove, not morning dove. You’re welcome.


yamamanama

We just call them modos.


KelMamud

China once won a battle against birds because they thought birds were eating grains. But it turns outs that was just a plan of birds. They acted like they lost the war. China's victory caused 43 million of Chinese to starve. Birds lost a battle but eventually won the war.


Lychee_No5

Ravens can speak (meaning mimic human language or other sounds) very well. Better than most people realize.


Inthecards21

Bird is the word


Ok-Chemical-7439

I like the tongue thing with wood peckers I think it's cool


RickDoesntCare

What's the tounge thing?


Ok-Chemical-7439

Their tounge goes around their skull so they don't get brain damage from hitting the tree


RickDoesntCare

That's crazy lol, thanks for the bird fact 😄


Ok-Chemical-7439

Yeah no problem


Incorrect_Facts_

Why this dude asking questions about American surveillance drones like they are real ?


llcucf80

Male mallard ducks have a green head, and the females are white spotted brown.


OneBlondeMama

Canadian Geese mate for life


Hum_baba_

And they're tougher than hell! The only thing tougher than Canada Gooses, is Canada Mooses


insertcaffeine

I would like to see a Canada Goose ride a Canada Moose into battle. On film. Fuck being anywhere near that in person.


EternalGandhi

Most of them can fly.


Mwemez

Pretty sure Magellanic Penguins can moo


RickDoesntCare

What?! 😅


Hum_baba_

Penguins have a gland in their head that desalinates the salt water they ingest. And the salt comes out their beak (bill?)


TorthOrc

Baby birds are called bees. (From the comedy series: Look around you)


emiliagoes

In US patriotic videos, when you hear an eagle screeching in the sky, it's really a hawk. Eagles dont make that sound. Their noise is more of a high click, not regal at all. Here's a video with sound ckips: https://youtu.be/e2PzwoxMLWs


Neat_Alternative28

Kiwi have tge shortest beaks of any known bird, when measured using the standard tip to nostril method.


Hoosierguy2

Birds use quantum mechanics to navigate. https://www.youtube.com/watch?v=TVorG6_csSA


notthesedays

Ducks have curlicued penises that they keep inside their bodies except when they're mating, and then they use it like a harpoon.


wish1977

Never flip it to someone bigger than you. It's dangerous.


Chahklet

I just learned how smart crows are! Thank you Reddit. Now I want one.


SmartKrave

Some birds are poisonous, learned that the hard way


runamie

The Galapagos Finch started off as one bird then separate into 13 different finches with different beak size and shapes.


RickDoesntCare

Is that the Darwin bird cos it's like specialized to different diets? I think I've heard of this before


-eDgAR-

You can rearrange all the countries in the world into [the shape of a chicken.](https://i.pinimg.com/originals/a2/18/21/a21821b774dda62412347c04d440489e.jpg)


RickDoesntCare

Lol


P0ster_Nutbag

Dinosaurs aren’t extinct! Birds are literally dinosaurs. You likely see dinosaurs every day, and hell, it’s pretty popular to eat dinosaurs too.


krustyarmor

If a bird smacks off your windshield and into the patrol car behind you, you could be pulled over for flipping a cop the bird.


Ok_Storage525

My favorite bird fact is that they can fly!


Helpful-Bandicoot-6

Many birds see into the UV spectrum and they have patches of feathers that reflect UV light (which we can't see).


RickDoesntCare

Another comment said that this was why female birds don't have bright colors. It's pretty neat


No-Fun1160

Ducks are violent rapists....


LJack49

Also that they are related to dinosaurs


9to5retireat35

I think most people know Owl flight is almost silent. It's so crazy to me how quiet it is.


RickDoesntCare

i saw a video a while back where they set up a ton of microphones around an owls flight. It's crazy silent.


9to5retireat35

BBC Earth is the one who did it. Compared it to a morning dove if I remember correctly. I love the smooth motion watching that clip.


WakingOwl1

I was lying n our picnic table one night watching meteor showers and just as I sat up an owl flew right over my head from a nearby tree. Didn’t hear a thing, scared the hell out of me. It’s because they have soft ruffles on the outer edges of their flight feathers.


Lvcivs2311

They are technically dinosaurs, since the only true criterium of being a dinosaur is "being a decendant of the first dinosaur".


Scrabulon

Hoatzin chicks have two claws on each wing that they use to climb around trees with. They lose them as adults. They also have a digestive system that utilizes fermentation more similar to a cow than other birds, and apparently actually smell kind of like manure because of it.


3kid100chicken

Chickens can swallow a mouse whole.


MacduffFifesNo1Thane

As of 2003, the airspeed velocity of an unladen European swallow was 24 miles per hour. You have to know these things to be a Redditor, you know.


No_usernames_l-ft

The fact that vultures are bald so they can get their head up their preys arse and eat them from the inside out without getting their feathers dirty 🫢


continue_Banca_3223

That pigeons mate forever, and if one dies, the partner visits the site where the partner died until the grieving is over by finding another mate. Thats what i read.


Adrien-Chauvet

Birds can see ultraviolet (UV) light.


retilioum

Some species of crows have on occasion befriended a cat. Although it mat be a one sided friendship


onioning

That they're dinosaurs. Literal dinosaurs. Not just "descendants of dinosaurs." Actual living dinosaurs. Really my favorite fun fact of any type. Means I get to say "we're having dinosaur for dinner!"


lemongrabsme

flamingoes can only eat when their heads are upside down


ANobleBean

A group of crows is called a ‘murder’…


sauron-is-lord

The peregrine falcon can fly up to 200mph (320km/h) as it dive bombs its prey. Badass!


dragonbeorn

They're dinosaurs. They're reptiles. They're more related to crocodiles than crocodiles are to lizards.


CookieFantastic6042

There are a few species where the female is more colourful, such as the belted kingfisher. Male and female blue jays are virtually identical.


Recktlikeme

You know when people call you bird brain take it with happiness reason birds are really smart.


AsparagusLoose9716

Shoe bill storks sound like machine guns.


RickDoesntCare

Oh I've seen this one, it's freaky


AsparagusLoose9716

They're also my favorite birb.


9gag_better

Favorite green heron fact is the neck is almost 100% hidden. One moment it looks like a small bird and then boom its like 4 times the height previously.


[deleted]

Make penguins sometimes have sex with corpses


RickDoesntCare

Oh no


bawzzz

They’re really birdy sometimes


[deleted]

Pigeons actually suck at building nests but try their best none the less to make a home


FactsLogicReason

Birds are living dinosaurs.


MissSara101

Here's a two for one about birds breaking the law: * Many gangs in Columbia were found to have birds with them. Their main jobs were to act like an alarm system. Many were trained to shout out certain words as codes. One case was even featured on *World's Dumbest*. * A cockatoo helped out their pigeon comrades in Australia by destroying a shopping center's anti-bird spikes. Cockatoos have stronger beaks than pigeons. There's a video about it.


Ok-Crow7223

Penguins give rocks as gifts


Iwannabeabluephoenix

There’s a bird called a Sungrebe, the males have pouches under their wings and they use them to carry their chicks away from danger. They can only fit 1 chick in each pouch though


ItsStarsYaBoi

some parrots like being petted because it makes them horny


Draclin

Penguins are pretty morally bankrupt, mainly adelie penguins


TaxOk1364

Emus started a war. That's why they're my favorite bird.


TaxOk1364

Crows use coat hangers as a substitution for sticks for their bird nests. They also have been seeing using street lights to crack open nut shells. They place their nuts on the street while the light is red, fly away when its yellow, wait for the cars to run over an crack open the nuts when the light is green, and then they come back to get their lunch when the light is red again.


GenesisWorlds

We've been ignoring female Birdsong for centuries.


CopsaLau

Kiwis lay eggs that are almost the same size as them, it’s so uncomfortable being so heavily laiden with these massive eggs that until they’re ready to lay, females can be found wading and resting in water because it helps support the weight of the egg and relieve some pressure in their poor little bodies. Also, since bird beaks used to be measured from tip to nostril rather than tip to face, and kiwis have their nostrils at the ends of their beaks to smell for prey in the dirt, they technically held the record for having one of the *shortest* beaks in the bird family.