These Extinct Birds Really Stretch the Definition of “Bird”

2 055 Shikime 208 mijë

This episode is brought to you by the Music for Scientists album! Stream the album on major music services here: streamlink.to/music-for-scientists. Check out “The Idea” music video here: alfirst.info/load/qIqwhHCZl6yelJc/video.
From birds with no wings to giant fowl that were once mistaken for predators, here are 6 birds that who's strange features may not be what you think of when you think of birds!
Hosted by: Stefan Chin
SciShow has a spinoff podcast! It's called SciShow Tangents. Check it out at www.scishowtangents.org
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Sources:
bit.ly/3tF3SJ2
www.ncbi.nlm.nih.gov/pmc/articles/PMC6626525/
academic.oup.com/sysbio/article/63/3/442/1649269
link.springer.com/article/10.1007%2Fs10336-009-0399-x#citeas
link.springer.com/article/10.1007%2Fs00114-006-0125-y#citeas
www.frontiersin.org/articles/10.3389/feart.2020.00367/full
journals.plos.org/plosone/article?id=10.1371/journal.pone.0167284
www.ncbi.nlm.nih.gov/pmc/articles/PMC2756958/
www.sciencedirect.com/science/article/pii/S0960982215009458#:~:text=Birds%20evolved%20from%20theropod%20dinosaurs,in%20one%20burst%20of%20innovation.
www.annualreviews.org/doi/abs/10.1146/annurev.ecolsys.33.010802.150517
www.tandfonline.com/doi/full/10.1080/14772019.2010.526639
evolution-outreach.biomedcentral.com/articles/10.1007/s12052-009-0133-4
onlinelibrary.wiley.com/doi/full/10.1111/pala.12351
bit.ly/3r5IiLV
www.sciencedirect.com/science/article/abs/pii/S0031018217307149
www.sciencedirect.com/science/article/abs/pii/S1871174X12000066
royalsocietypublishing.org/doi/full/10.1098/rstb.2018.0248
pubmed.ncbi.nlm.nih.gov/24563098/
onlinelibrary.wiley.com/doi/full/10.1111/j.1475-4983.2012.01195.x
advances.sciencemag.org/content/6/49/eabb6095?fbclid=IwAR2PKR3u2nZ0s4kOU-QZH9mZTHB8-YMZ6gmvGAVTV8mBkGjYpSdXEYccSTA
www.researchgate.net/publication/6730231_Palaeontology_Skull_morphology_of_giant_terror_birds
pubs.geoscienceworld.org/jgs/article-abstract/155/1/1/93849/A-new-giant-ground-bird-from-the-Upper-Cretaceous?redirectedFrom=fulltext
www.pnas.org/content/111/29/10624.full
bioone.org/journals/journal-of-vertebrate-paleontology/volume-30/issue-5/02724634.2010.501465/Osteology-of-a-New-Giant-Bony-Toothed-Bird-from-the/10.1080/02724634.2010.501465.full
www.ncbi.nlm.nih.gov/pmc/articles/PMC1906724/
www.nature.com/articles/s41598-020-75248-6
epub.ub.uni-muenchen.de/12011/1/zitteliana_2008_b28_09.pdf
Image Sources:
commons.wikimedia.org/wiki/File:Xiaotingia_by_Qilong.jpg
commons.wikimedia.org/wiki/File:Twelfth_Archaeopteryx_specimen.jpg
upload.wikimedia.org/wikipedia/commons/thumb/5/55/Velociraptor_Restoration.png/1280px-Velociraptor_Restoration.png
commons.wikimedia.org/wiki/File:Microraptor_Restoration.png
commons.wikimedia.org/wiki/File:Jeholornis_mmartyniuk_wiki.jpg
commons.wikimedia.org/wiki/File:Jeholornis-Paleozoological_Museum_of_China.jpg
commons.wikimedia.org/wiki/File:Archaeopteryx-modern_bird_tails.png
commons.wikimedia.org/w/index.php?curid=86414955
journals.plos.org/plosone/article?id=10.1371/journal.pone.0184637
commons.wikimedia.org/wiki/File:Gobipteryx_sp_eggs.JPG
commons.wikimedia.org/wiki/File:Hesperornis_BW.jpg
commons.wikimedia.org/wiki/File:Hesperornis_regalis_(1).jpg
commons.wikimedia.org/wiki/File:Animals_of_the_past_-_an_account_of_some_of_the_creatures_of_the_ancient_world_(1929)_(18012757429).jpg
commons.wikimedia.org/wiki/File:Gastornis.png
commons.wikimedia.org/wiki/File:Gastornis_geiselensis.jpg
commons.wikimedia.org/wiki/File:Phorusrhacid_skeleton.jpg
commons.wikimedia.org/wiki/File:Aepyornis_maximus.jpg
commons.wikimedia.org/wiki/File:Pelagornis_chilensis_1.jpg
commons.wikimedia.org/wiki/File:Pelagornis_mauretanicus.jpg
commons.wikimedia.org/wiki/File:Pelagornis_miocaenus.jpg
commons.wikimedia.org/wiki/File:Pterosaur_(Zhengzhou).jpg

Komente

  1. SciShow
    SciShow
    21 ditë më parë

    This episode is brought to you by the Music for Scientists album! Stream the album on major music services here: streamlink.to/music-for-scientists. Check out “The Idea” music video here: alfirst.info/load/qIqwhHCZl6yelJc/video.

    1. George B. Wolffsohn
      George B. Wolffsohn
      7 ditë më parë

      How about music BY scientists ?

    2. Cheshire Kitten
      Cheshire Kitten
      10 ditë më parë

      The largest flying bird is an Albatros? What about Condors?

    3. Mr. IISc
      Mr. IISc
      18 ditë më parë

      Are phytoplanktons and zooplanktons closely related to each-other, as per their family trees? Make a video on this topic.

    4. Jason Brokas
      Jason Brokas
      21 ditë më parë

      8

  2. Dinosaur Asher
    Dinosaur Asher
    5 ditë më parë

    Wow great video

  3. Christopher Noel
    Christopher Noel
    5 ditë më parë

    No mention of the internal structure of the bones themselves, nor layout of their respiratory system. These are important features of birds today, but how important was it back then?

  4. jermaine gayle
    jermaine gayle
    6 ditë më parë

    They were birds we have goat ox antelope we have apes humans and monkeys we have eels bony fish sharks

  5. Mike Tacos
    Mike Tacos
    7 ditë më parë

    "What ARE birds? We just don't know."

  6. Chris B
    Chris B
    8 ditë më parë

    No one gets it right, but he correct pronounciation of "Archaeopterix" should be "Arch-AE-o-TER-ix" (not Arch-ae-OP-ter-ix), as this name is derived from two Greek words, "archaios" and "pteryx" ("ancient wing").

  7. thetommantom
    thetommantom
    9 ditë më parë

    Opposite bird like a cat

  8. Joseph Brockway
    Joseph Brockway
    9 ditë më parë

    Birds are reptiles. You're introducing old concepts like new news and with old information.

  9. xenophontiacicidationarionism
    xenophontiacicidationarionism
    10 ditë më parë

    The host looks like he should have GIlbert Gottfried's voice

  10. NachoCheese
    NachoCheese
    10 ditë më parë

    "Four-winged Micro-Raptor" Whelp, I just found my spirit animal! (Emphasis on the "spirit")

  11. Traci Morales
    Traci Morales
    11 ditë më parë

    Well now I’m just more afraid of geese than I was previously. 😅

    1. slwrabbits
      slwrabbits
      Ditë më parë

      That is the appropriate response to geese. They're just plain evil.

  12. Solo Bat-Erdene
    Solo Bat-Erdene
    13 ditë më parë

    alfirst.info/load/bXaRcW3LiKqcoXU/video

  13. botterik81
    botterik81
    13 ditë më parë

    The Dino/ad ratio is getting ridiculous

  14. sparky9c22
    sparky9c22
    13 ditë më parë

    Do not fear. Live or die, have FAITH in Jesus Christ! Thank you.

    1. Addison Lea
      Addison Lea
      12 ditë më parë

      But was Christ a dinosaur or a primitive bird??

    2. jacqueline schael
      jacqueline schael
      13 ditë më parë

      ??????

  15. Kazmir Runik
    Kazmir Runik
    14 ditë më parë

    Bird is but a word

  16. Traekas7!
    Traekas7!
    14 ditë më parë

    Where do Pterodactyls fall in the group you’ve been talking about??

    1. Traekas7!
      Traekas7!
      14 ditë më parë

      @Craton Orogen Oh. Okay. Thanks. I haven't been in school for decades, now. I probably just forgot, lol !!!

    2. Craton Orogen
      Craton Orogen
      14 ditë më parë

      Nowhere because pterodactyls weren’t dinosaurs, just flying reptiles. They didn’t share recent common ancestors with dinosaurs and consequently with birds.

  17. culwin
    culwin
    15 ditë më parë

    Call them Dribs

  18. tian herselman
    tian herselman
    16 ditë më parë

    This was a enlightening episode. Thank you!

  19. Nancy Cousintine
    Nancy Cousintine
    16 ditë më parë

    That's the most plucked archaeopteryx I've ever seen in an illustration..no wonder he looks a bit pissed, or maybe he's just dancing, trying to stay warm...you know, because of the whole "plucking" situation. Cheers :)

  20. Nebur Wolf
    Nebur Wolf
    16 ditë më parë

    All I heard while watching this video, is that bird is the word.

  21. João Pedro
    João Pedro
    17 ditë më parë

    I never understand archeopteryx bring considered as a bird. If you put then together based in diagnostix features like wings or based that they are closer to birds than to non-avian dinosaurs why not includ velociraptor or other miniraptorian. I Remember that in cladistics a new species is included in a natural group that they are within. If archeopteryx is a sister taxa to all the extant bird that would make a new group. If that's not true why not includ all the pseudo suchians as crocodiles ir all the mammaliforms as mammals?

  22. Peter Robinson
    Peter Robinson
    17 ditë më parë

    Us troglodytes would enjoy these posts more if you gave the feet/pound equivalent so we don't have to stop the video to calculate on our fingers and toes. Thats too much mental gymnastics at 3:00 am. Eons doesn't make me do that.

  23. ___ I3ambi
    ___ I3ambi
    17 ditë më parë

    I find it funny noticing that every major animal group (maybe being a little too vague) has had a time where it defined the period. And the versions that stuck around were often not why they originally evolved nor the most common type. I feel non-human mammals might be most likely to live on in the water. Whales and dolphins are extremely good at being underwater predators. Breaking records for the largest ever.

  24. Polly Pocket
    Polly Pocket
    17 ditë më parë

    SciShow: So. You think you know what a bird is... *Me, looking at my parrot* : Yes

  25. Sagacious Eagle
    Sagacious Eagle
    18 ditë më parë

    Ah yes, my convoluted lineage.

  26. pineapplepenumbra
    pineapplepenumbra
    18 ditë më parë

    I've forgotten the Latin name, but New Scientist had an article years ago about one they dubbed the "Demon Duck of Doom". I think it was about 2.5 metres high and weighed about 300 kg, or something like that.

    1. pineapplepenumbra
      pineapplepenumbra
      Ditë më parë

      @slwrabbits That's the trouble, I can't remember such details about the article. So you might be right.

    2. slwrabbits
      slwrabbits
      Ditë më parë

      I thought that was Gastornis?

  27. Michael Teta
    Michael Teta
    18 ditë më parë

    Why have I never seen the microraptor before that thing is so cool.

  28. Charlie Cook
    Charlie Cook
    18 ditë më parë

    how y'all managed to talk about diving flightless birds and think to compare them to ducks instead of penguins is beyond me

  29. Xeneosz Omega
    Xeneosz Omega
    18 ditë më parë

    I love this guys ears keep up the good content

  30. Reymart Bara
    Reymart Bara
    18 ditë më parë

    velociraptor of jurassic world doesnt have bird like features is that a joke?

  31. Mr. IISc
    Mr. IISc
    18 ditë më parë

    Are phytoplanktons and zooplanktons closely related to each-other, as per their family trees? Make a video on this topic.

    1. João Pedro
      João Pedro
      17 ditë më parë

      No. Plancton is not a Taxonomic group of animals It is more like a way of life in the ocean. They includ all microscopic live beings that live fluctuating and carried by the tides. Phytoplancton are those who are photosyntetic and zooplancton i think a manly composed by animals, this includ even crustaceans larvae.

  32. David Foster
    David Foster
    18 ditë më parë

    When I was a kid I said a T-Rex was a bird, and the whole class laughed at me. NOW who's laughing BI-ATCH?!

    1. Gerry the bary
      Gerry the bary
      17 ditë më parë

      Well tyrannosaurus is not really a bird.... But its closely related to birds tho! Easy to remember it by is like this: "this all birds are dinosaurs but not all dinosaurs are birds!" Stating a chicken is a dinosaurus would be accurate stating a tyrannosaurus is a bird is inaccurate Yeah its confusing when i explain it😂 Sorry!

  33. Danny Maurice
    Danny Maurice
    18 ditë më parë

    Hesperonis looks like a really messed up penguin

  34. janegael
    janegael
    19 ditë më parë

    I know you want to sound scientific but please, please give US measurements as well. I know that I'm not the only one that can't translate to metric as quickly as you talk. It makes your videos less enjoyable to have to struggle through math and miss important info as a result.

  35. tj4234
    tj4234
    19 ditë më parë

    I for one am glad birds are no longer the size of pterosaurs

  36. Freddie Dunning-Kruger Jr.
    Freddie Dunning-Kruger Jr.
    19 ditë më parë

    "Birds Aren't Real"

    1. Freddie Dunning-Kruger Jr.
      Freddie Dunning-Kruger Jr.
      19 ditë më parë

      alfirst.info/load/roOrome3l82Do4E/video

  37. Freddie Dunning-Kruger Jr.
    Freddie Dunning-Kruger Jr.
    19 ditë më parë

    Werm Hat? 🪱🎩 Denim Chicken? 👖🐓 Bird with Teeth? 🐦🦷 🤣🤣🤣🤣🤣🤣

  38. Chuzz Bot
    Chuzz Bot
    19 ditë më parë

    Think before you shout.

  39. Prime Rib
    Prime Rib
    19 ditë më parë

    Many types of fully modern bird fossils have been found with those of dinosaurs including ducks, loons, flamingos, albatross, owls, penguins, sandpipers, parrots, cormorants, avocets, as well as extinct birds such as Archaeopteryx and Hesperornis. Therefore, Archaeopteryx cannot be, "the first bird." The Tooth-billed Hummingbird that exists today has teeth. Meanwhile, the Hoatzin has functional claws on its wings. Though these features are rare, they do exist.

  40. ike eki
    ike eki
    19 ditë më parë

    awesome

  41. Joan Hoffman
    Joan Hoffman
    19 ditë më parë

    Hesperornis had to come to land at some point, to lay and hatch eggs. Chicks aren't born with gills...but it would be pretty cool if they were!

  42. Kate S
    Kate S
    19 ditë më parë

    For me all theropods are birbs! They are birb-ey, so they are birbs

  43. LUKE WUNDERLI
    LUKE WUNDERLI
    19 ditë më parë

    So... Gastornis was basically a terror bird, but it didn’t eat meat

    1. LUKE WUNDERLI
      LUKE WUNDERLI
      19 ditë më parë

      Good Point

    2. Eko Subandie
      Eko Subandie
      19 ditë më parë

      The closest modern analogue to it was probably the cassowary and you know the reason why

  44. Marco Roepers
    Marco Roepers
    19 ditë më parë

    When I clicked on this video I thought it was on the PBS Eons channel.

  45. Jace Jan
    Jace Jan
    19 ditë më parë

    This guy should dress up as Pee Wee Hermam for costume parties and Halloween.

  46. Katrina Hockman
    Katrina Hockman
    20 ditë më parë

    How is this the first I've ever heard of a raptor with four wings.

  47. Adam Wishneusky
    Adam Wishneusky
    20 ditë më parë

    psshh. this video is for the birds

  48. Adam Yell
    Adam Yell
    20 ditë më parë

    The line between what is a bird and what isn't is immensly blurry and i'm glad this video is out there to talk about it in a way so eady to understand. The fact that there's still people today who think birds and non avian dinosaurs were two drastically different things is outrageous, not on them, but on the fact that pop culture and saltlords on the internet keep spreading misinformation to keep the idea that dinosaur = monster well alive in people's minds, all for profit or just self validation, and JW: Dominion, with it's immensly half-assed broken wristed, parrot-like giant pyroraptor, and ARK 2 with it's claim of "hyper realistic dinosaurs", are just proof that companies won't stop beating that long fossilized horse as long as people get more accessible "informations" from idiots who still simp the isle rather than from videos like these which actually care about the matter at hand. It's so hard to get into paleontology because of the overwhelming ammount of misinformation out there that's falsly veiled as legit because a lot of people say it, or the person saying it is famous (:cough: tierzoo :cough:), and i'm very thankful for videos like this that bring actual good information in a great format and to a wider audience. :^)

  49. Angelique Barbey
    Angelique Barbey
    20 ditë më parë

    This is the best and certainly the most complete video about birds I have ever come across....and is likely to ever come across in the future.

  50. Organon
    Organon
    20 ditë më parë

    20-40 KIlograhams. Impressive.

  51. Organon
    Organon
    20 ditë më parë

    When did it go from 65 to 66 million years ago. Did I miss a million years, am I that old?

  52. Grimbeard
    Grimbeard
    20 ditë më parë

    "I'm more than a bird. I'm more than a plane. I'm a birdplane. A motherfucking birdplane." _Birdplane_ by Axis of Awesome.

  53. CLipka2373
    CLipka2373
    20 ditë më parë

    Is it a bird? Is it a plane? No, it's SUPERDINO!

  54. Jorge Stolfi
    Jorge Stolfi
    20 ditë më parë

    Maybe the atmosphere was denser in the time of pterosaurs?

  55. Cthultystka
    Cthultystka
    20 ditë më parë

    The last bit made me wonder... Bats have the same method of takeoff as pterosaurs had, so what is limiting their size?

    1. Eko Subandie
      Eko Subandie
      19 ditë më parë

      Their mammalian bone structures are their only limiting factor (mind that their bones are not hollow like birds nor have air sac in it, only thin) The largest hypothetical bats that can still fly could probably never reached the size of even a medium-sized pterosaurs, unless they become semi-terrestrial or completely flightless

  56. Cody Spinelli
    Cody Spinelli
    20 ditë më parë

    But.. but... how can you mention the pelagornithidae without mentioning the teratornithidae? 🦅

  57. Alioramus163
    Alioramus163
    20 ditë më parë

    Avian dinosaurs are sill very successful. Mammals are the dominant terrestrial animals but only number about 4,000 species while birds number about 10,000 species. That's more than twice as much.

  58. Elios0000
    Elios0000
    20 ditë më parë

    well its more that birds are dinosaurs... better wording would be avian dinosaur then bird

  59. Time Traveller 2100
    Time Traveller 2100
    20 ditë më parë

    Imagine if how delicious is their meat making those bird into dish. 😋😋

  60. Hans Isbrücker
    Hans Isbrücker
    20 ditë më parë

    But did those early birds catch the worm? 🤔

  61. Styx
    Styx
    20 ditë më parë

    Birds are Not real

  62. Kerry Fitch
    Kerry Fitch
    20 ditë më parë

    “Category “, “species “, etc can’t pen point anything. The Heidelberg uncertainty principle in effect.

  63. Tom Patterson
    Tom Patterson
    20 ditë më parë

    Velociraptors are birds. Change my mind

  64. Zachary Allen
    Zachary Allen
    20 ditë më parë

    They had hands on their wings? Okay so they're dragons.

  65. Timotheus24
    Timotheus24
    20 ditë më parë

    after the inevitable extinction of whales who's gonna take their ecological niche? well i put my money on penguins. 30 meter long 100 metric tons filter feeding penguins. let's find out in the next 50 million years.

    1. Ryan M.
      Ryan M.
      4 ditë më parë

      There’s not really such a thing as “inevitable extinction”. Just look at how long sharks and crocodilians have been around.

    2. Augusto Griffi
      Augusto Griffi
      18 ditë më parë

      @Timotheus24 Perhaps they can briefly take over the vacant ecological niche until the new warm blooded former land animal takes over, but this is maybe a very teleological and reductionist view of evolution.

    3. Timotheus24
      Timotheus24
      20 ditë më parë

      @Augusto Griffi there is a reason they already got outcompeted by warm blooded former land animals twice....

    4. Augusto Griffi
      Augusto Griffi
      20 ditë më parë

      Bigger whale sharks or manta rays?

  66. macsnafu
    macsnafu
    20 ditë më parë

    2 meters tall and 150 kgs? Doesn't tell me a darned thing until I look up the conversion. If you can't be bothered to provide the conversion to the Imperial system, how about including a human as a scale model to go with the picture? That would have told me in an instant that the Gastornis was a "Big Bird".

  67. Perrenial Millennial
    Perrenial Millennial
    20 ditë më parë

    Did you just implicate that scientists only listen to scientific music? sounds pretty bigoted to me.

  68. Furui Shin
    Furui Shin
    20 ditë më parë

    Modern day birds usually develop quickly after hatching, but then... there is kakapo. 😂

  69. Platanov
    Platanov
    20 ditë më parë

    "What are birds? We just don't know."

  70. Drew TheCEO
    Drew TheCEO
    20 ditë më parë

    I want an archaeopteryx

  71. Steve 059
    Steve 059
    20 ditë më parë

    They're birds Jim but not as we know them.

  72. Leonardo Gurney
    Leonardo Gurney
    20 ditë më parë

    Birds 150 million years ago: "AWSOOOOOOOOOOMMME!!!" Birds today: "Eeeeeeeeeeeeeeeeeehhhhh............."

  73. Felisquoreda
    Felisquoreda
    20 ditë më parë

    Sing it with me: birdie teeth are back! 🎶 Birdie's back alright! 🎶

  74. Hakorai
    Hakorai
    20 ditë më parë

    A Velociraptor had WINGS??

  75. Zarcondeegrissom
    Zarcondeegrissom
    20 ditë më parë

    Enantiornithes, nice. there cool like Microraptor, and Archeopteryx. I really wouldn't call any of them 'birds' as much as I wouldn't call them dinosaurs simply because of the preconception many have of what "birds as we know them" or dinosaurs look like.

    1. Dennis Feenstra
      Dennis Feenstra
      19 ditë më parë

      Those preconceptions are of course the faulty understanding of laypeople. Monophyly is pretty clear on the ground rules for taxonomic classification.

  76. Sully09
    Sully09
    21 ditë më parë

    should the "pt" in Archaeopteryx be the same as the "pt" in Pterodactyl? I've always wondered if its just easier to pronounce the "p".

    1. Caviramus 09
      Caviramus 09
      20 ditë më parë

      It should be pronounced the same way.

  77. Jeffrey Lemal
    Jeffrey Lemal
    21 ditë më parë

    Just nonavianian dinosaurs.

  78. Nick Korkodylas
    Nick Korkodylas
    21 ditë më parë

    DEFINING BIRD LEVEL: ASIAN The stereotype is not -only- directed to the presenter of the video, most transitional fossils of proto-birds came from China and Mongolia.

  79. Tommy Jansen
    Tommy Jansen
    21 ditë më parë

    Nature doesn't care what we classify/define creatures as. We are just catching up to millions of years of history. And that is ok.

  80. Arno Blümel
    Arno Blümel
    21 ditë më parë

    "...back then, they were just birds." I'm pretty sure the contemporary term was "Skreee!". Or "Roar!", in some dialects.

  81. Diane Wallace
    Diane Wallace
    21 ditë më parë

    Stefan is funny and looks like he has been lifting weights. I learned a lot from this video about crown birds since the mass extinction event and the explanation as to why crown birds are limited in size is interesting.

  82. Shirofeather
    Shirofeather
    21 ditë më parë

    Gastornis = Chocobo?

  83. Guilherme Pimenta
    Guilherme Pimenta
    21 ditë më parë

    So you're telling me birds didn't get as big as pterosaurs because they're thicc?

  84. Night _Watch
    Night _Watch
    21 ditë më parë

    Bro wa happen? Wa happen to your hair?

  85. Radu Cristescu
    Radu Cristescu
    21 ditë më parë

    So... A genede decided to produce feathers or somesuch instead of fur or scales, right?

  86. Vincent Jackson
    Vincent Jackson
    21 ditë më parë

    I'm supposed to believe Birds have been around in a recognisable form for 150 million years but also believe that a branch of Lungfish became terrestrial Amphibians in 1/10th that amount of time? Gotta love just how ridiculous and illogical Macroevolution sounds.

    1. Dennis Feenstra
      Dennis Feenstra
      19 ditë më parë

      *"I'm supposed to believe"* It doesn't require your belief. Facts don't care about your creationist feelings.

    2. Dennis Feenstra
      Dennis Feenstra
      19 ditë më parë

      @Vincent Jackson *"Microevolution is observable and testable "* Every single trait which has been observed to change are the traits which need to change for "macroevolution" to be true. The amount of change observed, which you call micro-evolution, is consistent with the rate of change occuring in that species and the selective pressures of their environment. There's nothing fundementally magical about bears and dogs sharing a common ancestor which you would call macro-evolution, when domesticated dogs, wolves, jackals and foxes provably share common ancestry. All the traits are evolving, in a specific direction, at a rate consistent with expectations.

    3. Dennis Feenstra
      Dennis Feenstra
      19 ditë më parë

      The rate of evolutionary change and the type of evolutionary change isn't a fundemental constant, skippy. Evolutionary change is mediated through selective advantages, which sometimes may be non-existent for the types of traits you'd love to see accumilate. As for the type of evolutionary change, the vertical derivation of regulatory networks are the backbone of the developmental differences between bodyplans. Thus, one kind of change in one derived form and another kind of change in a completely different derived form are not interchangable when both changes would require a specific derived gene network.

    4. Vincent Jackson
      Vincent Jackson
      20 ditë më parë

      @Augusto Griffi Microevolution is observable and testable while Macroevoltion is a cult based on supposition and assumptions instead of hard data or actual science. There's no consistency and dozens of plotholes in the macroevolutionary hypothesis such as varying rates of evolution between and within lineages that make the idea of "constant accumulation of mutations" a wholly insufficient explaination for what's going on.

    5. Augusto Griffi
      Augusto Griffi
      20 ditë më parë

      Please, explain to me, what keeps microevolution "micro"? What are the mechanisms that stop the process of natural selection at an arbitrary line? If a species can adapt to its environment by way of small changes caused by selective pressure why can't these changes amass to create a new one?

  87. Peter
    Peter
    21 ditë më parë

    Chicken embryo grow teeth but in the late stage of development the teeth get covered by the beak. The chemical makeup of feathers is also close to scales and they found the gene responsible for it. We could easily manipulate bird dna to have teeth and scales

    1. Caviramus 09
      Caviramus 09
      20 ditë më parë

      There was a study making proto-feathers in alligator embryos.

  88. Dan Z
    Dan Z
    21 ditë më parë

    CHOCOBO 7:20

  89. Marco Pohl
    Marco Pohl
    21 ditë më parë

    how about "A theropod which can fly or descended from a flying ancestor"?

  90. Peter
    Peter
    21 ditë më parë

    What if evolution is more of a spectrum, and not a series of steps

    1. Dennis Feenstra
      Dennis Feenstra
      19 ditë më parë

      @Augusto Griffi I wouldn't call it a problem. The fact we're only finding some fossils, is a blessing for taxonomic classification. It's just that laypeople misinterpret it.

    2. Augusto Griffi
      Augusto Griffi
      20 ditë më parë

      That's exactly what it is, the problem is the taxonomic classification that we use to group organisms in categories.

  91. Petitio Principii
    Petitio Principii
    21 ditë më parë

    It's very intriguing why only neornithine birds have survived the K-T extinctions, and no enantiornithe at all. More intriguing than even why crocs still are around. It makes it seem like the non-croc and non-neornithe intermediates were all in some sort of disadvantage (or sets of disadvantages) for the extinction scenario.

  92. TenorCantusFirmus
    TenorCantusFirmus
    21 ditë më parë

    It's early installment weirdness.

  93. Petitio Principii
    Petitio Principii
    21 ditë më parë

    The dino/bird distinction is so blurry now that some paleontologists have theorized that possibly some Velociraptor-related dinosaurs, maybe including Velociraptors themselves, and their bigger cousins, Deinonichus (the ones from Jurassic Park), were really the first flightless birds, having had ancient flying birds more like Archaeopteryx in their ancestry. There was at least one cladistic analysis (Mayr, 2005) that had Archaeopteryx as more basal/ancestral than those dinosaurs, making them really the first flightless birds.

  94. Soulife
    Soulife
    21 ditë më parë

    Evolution is weird. It all started with a puddle; Lizards became birds, muskrats became people, and Pengolans became coronavirus. Darwin was one crazy mofo

  95. Soulife
    Soulife
    21 ditë më parë

    That's not a nife... THIS is a nife.

  96. samantha ferrell
    samantha ferrell
    21 ditë më parë

    I always laugh to myself about the penguin.

  97. Weyrleader M'ry
    Weyrleader M'ry
    21 ditë më parë

    Who else is watching this video with a bird friend?

  98. Elton Alabado69
    Elton Alabado69
    21 ditë më parë

    in short, birds existed before all the modern birds and replace them?

  99. Ghostdialoog
    Ghostdialoog
    21 ditë më parë

    I love birds.

  100. DEVON BLAKE
    DEVON BLAKE
    21 ditë më parë

    Fiery flying serpents