The three different ways mammals give birth – Kate Slabosky

What do these animals have in common? More than you might think. Along with over 5,000 other species,
they’re mammals, or members of class mammalia. All mammals are vertebrates,
meaning they have backbones. But mammals are distinguished
from other vertebrates by a number of shared features. That includes warm blood, body hair or fur, the ability to breathe using lungs, and nourishing their young with milk. But despite these similarities, these creatures also have
many biological differences, and one of the most remarkable
is how they give birth. Let’s start with the most familiar,
placental mammals. This group includes humans, cats, dogs, giraffes, and even the blue whale,
the biggest animal on Earth. Its placenta, a solid disk
of blood-rich tissue, attaches to the wall of the uterus
to support the developing embryo. The placenta is what keeps
the calf alive during pregnancy. Directly connected to
the mother’s blood supply, it funnels nutrients and oxygen
straight into the calf’s body via the umbilical cord, and also exports its waste. Placental mammals can spend far
longer inside the womb than other mammals. Baby blue whales, for instance, spend
almost a full year inside their mother. The placenta keeps the calf alive
right up until its birth, when the umbilical cord breaks and the newborn’s own respiratory, circulatory, and waste disposal systems take over. Measuring about 23 feet,
a newborn calf is already able to swim. It will spend the next six months drinking 225 liters of
its mothers thick, fatty milk per day. Meanwhile, in Australia,
you can find a second type of mammal – marsupials. Marsupial babies are so tiny and delicate
when they’re born that they must continue developing
in the mother’s pouch. Take the quoll, one of the world’s
smallest marsupials, which weighs only 18 milligrams at birth, the equivalent of about 30 sugar grains. The kangaroo, another marsupial, gives birth to a single
jelly bean-sized baby at a time. The baby crawls down the middle
of the mother’s three vaginas, then must climb up to the pouch, where she spends
the next 6-11 months suckling. Even after the baby kangaroo leaves
this warm haven, she’ll return to suckle milk. Sometimes, she’s just one of three babies
her mother is caring for. A female kangaroo can often simultaneously
support one inside her uterus and another in her pouch. In unfavorable conditions, female kangaroos can pause
their pregnancies. When that happens, she’s able
to produce two different kinds of milk, one for her newborn, and one for her older joey. The word mammalia means of the breast, which is a bit of a misnomer because while kangaroos do produce
milk from nipples in their pouches, they don’t actually have breasts. Nor do monotremes, the third and arguably
strangest example of mammalian birth. There were once hundreds
of monotreme species, but there are only five left: four species of echidnas
and the duck-billed platypus. The name monotreme means one hole referring to the single orifice they use
for reproduction, excretion, and egg-laying. Like birds, reptiles, fish, dinosaurs, and others, these species lay eggs instead
of giving birth to live young. Their eggs are soft-shelled, and when their babies hatch, they suckle
milk from pores on their mother’s body until they’re large enough
to feed themselves. Despite laying eggs and other adaptations
that we associate more with non-mammals, like the duck-bill platypus’s webbed feet, bill, and the venomous spur
males have on their feet, they are, in fact, mammals. That’s because they share the defining
characteristics of mammalia and are evolutionarily linked
to the rest of the class. Whether placental, marsupial, or monotreme, each of these creatures and its unique
birthing methods, however bizarre, have succeeded for many millennia
in bringing new life and diversity into the mammal kingdom.


  1. Saxs January 26, 2020 at 4:37 pm

    The majority of the world: Yeah our mammals just give birth to live young


  2. PutrIsCool January 26, 2020 at 10:56 pm

    1:40 full odds shiny wailmer

  3. Electro Void January 26, 2020 at 11:45 pm

    i just realized that perry the platypus can just kill doof in one stab

  4. Lukus Brookes January 27, 2020 at 5:48 am

    Y'all telling me whales have fur

  5. PandaGod January 27, 2020 at 2:52 pm


  6. plaun dorkon January 28, 2020 at 7:48 am

    225 litre of milk,and I've never seen any nipples on 🐋

  7. Kai Anthony January 28, 2020 at 3:45 pm

    Shouldn’t be 4? Like, how the female hyena, This is a kid friendly show, I can’t say it

  8. Александр Зябликов January 28, 2020 at 8:04 pm

    Очень познавательно и интересно!Молодцы👏👏👏

  9. Leprosu Gnome January 29, 2020 at 1:40 am

    I love how every animal in this video looks happy

  10. Frank Espino January 29, 2020 at 8:14 pm

    T H I C C and F A T T Y milk

  11. Lion Shard1635 January 30, 2020 at 10:29 pm



    Not a single soul


  12. crazybrickstudios January 31, 2020 at 5:31 am

    Honestly kangaroo birth doesn’t sound too bad. All the little baby’s got to do is just crawl out.

  13. Sweep your speech January 31, 2020 at 5:16 pm

    Thank you for that lession

  14. JurassicSmackdown February 1, 2020 at 2:28 am

    nice, that was pretty informative! Narrator has a pleasant voice, cute art style, and very clear to understand

  15. MAV February 1, 2020 at 5:27 am

    So male humans are not mammals then

  16. Apro101 Roblox, Minecraft, and more! February 1, 2020 at 6:48 pm

    This was published the Day before my birthday XD

  17. King_of_Nerdz February 1, 2020 at 9:35 pm

    I knew this but how do Pokémon reproduce

  18. Kitty S February 2, 2020 at 5:54 am

    Three vaginas? 😁

  19. Woomy Dayz February 2, 2020 at 11:31 pm

    Ok but she really said melk

  20. Swords And sandals February 3, 2020 at 10:55 am

    “Mothers three vaginas”


  21. Andrew February 4, 2020 at 2:50 pm

    Dimetrodon : I don't think so…

  22. Emmanuel Gallo February 5, 2020 at 1:30 am

    The truth

  23. The Serrot February 5, 2020 at 2:55 pm

    so when candace became perry in one episode she said she was sweating milk… does that mean perry's a she?

  24. Hayat Khayyoo February 6, 2020 at 1:36 am

    "Thick fatty milk
    Me: XD 😂

  25. Maya Herabi February 6, 2020 at 3:01 am

    Thick Fatty Milk oi

  26. Soyuzbek orozbek uulu February 6, 2020 at 11:59 am

    Allah is Great. Indeed He is the Beautiful Creator.

  27. good for you February 6, 2020 at 2:34 pm

    So wales can breastfeeding too?

  28. Xsilly YEET520X February 6, 2020 at 10:11 pm

    Why is this in my recomended

  29. cuong bui February 7, 2020 at 4:15 am

    Storks are no longer part of the process?

  30. henryjw15 February 7, 2020 at 5:47 am

    What do these mammals have in common? A synapsid skull. Your welcome

  31. Babacar Ka February 7, 2020 at 5:13 pm


  32. King Boo February 8, 2020 at 4:52 am

    So we're just going to ignore the fact that knuckles one of the mammals in this?! ok then…..

  33. ටුටූ බ්‍රෝ /tutu bro February 8, 2020 at 5:58 am


  34. Aniket Siriya February 8, 2020 at 9:13 am

    Mammals are the highest class of all living beings on earth
    Who else agrees?

  35. Synmon F February 8, 2020 at 9:58 am

    God: How many marsupial mammals do you want?
    Australia: Yes!

  36. Patton Case February 8, 2020 at 7:39 pm

    So basically there’s live birth, pouch, and of course

    E G G

  37. Tejas Salgaonkar February 9, 2020 at 9:34 am

    By far a knowledgebl vedio

  38. Maxamed Axmedn February 9, 2020 at 10:08 am

    Oh i want to test whale's milk

  39. FoxSakeAce February 9, 2020 at 11:03 am

    It would be handy being a kangaroo than

  40. Swivelman Roblox February 9, 2020 at 11:55 am

    Fed-ed : 3 vaginas
    Me: W.. WHATT???

  41. mcdonald's inheritances February 9, 2020 at 1:37 pm

    welp, i have a totally differnt view ab perry the platypus now

  42. Alessandro Rossi February 9, 2020 at 9:59 pm

    Lovely video, but what's up with mixing systems of measurement?
    You go from "23 feet" to "225 liters" and "18 milligrams"

  43. Soviet Doggo February 10, 2020 at 1:33 am

    what is the fastest animal to give birth?

  44. lynris February 10, 2020 at 5:26 am

    if i had three vaginas my whole body would be covered in period blood.

  45. blueberry kyoong February 10, 2020 at 3:50 pm

    So that's why in phineas and ferb, there was this one episode where candace switched bodies with perry and then when candance was in perry's body, she said why is she sweating milk. It all makes sense now.

  46. The Last Tenno February 10, 2020 at 5:56 pm

    2:25 Lucky for the Male lol..

  47. Primarch Gulliman February 10, 2020 at 10:13 pm

    Excuse me 3 vaginas?

  48. Mr_Wiggles February 10, 2020 at 11:34 pm

    Yet frikins heads are big to actually make there way through so we have skull fragments at first

  49. Lyric Cha February 11, 2020 at 1:53 am


  50. xolonelystar February 11, 2020 at 2:15 am

    Marsupials are even stranger than i thought

  51. Jyeon Park February 11, 2020 at 3:13 am

    Thats why blue whale is endangered

  52. Gronk543 Gaming February 11, 2020 at 4:53 am

    69k likes nice

  53. oscar agres February 11, 2020 at 9:11 am

    The question is how does a whale Frick

  54. aesthetic sounds asmr February 11, 2020 at 9:03 pm

    2:26 how do you say that so casually?

  55. Sam Sajn February 11, 2020 at 11:03 pm

    2:25 3 pussies

  56. neale browning February 12, 2020 at 4:31 am

    That blue whale looks so worried. ¤_¤

  57. Roronlox 34-34 February 12, 2020 at 9:38 am

    U forgot the human

    Bc its a…..


  58. Havril Hutchinson February 12, 2020 at 12:56 pm


  59. Electron Animated February 12, 2020 at 1:21 pm


  60. Freon Ofredo February 12, 2020 at 1:57 pm

    Other mammals gave birth with eggs

  61. Rishish mishra February 12, 2020 at 6:05 pm


  62. Will Avery February 13, 2020 at 4:54 am

    If platypuses use eggs and also have milk, does that mean that platypuses are like walking omelette machines?

    I thought of this in the shower have been thinking about this for 3 hours please help.

  63. Davit Windya February 14, 2020 at 12:21 pm

    They didnt teach this on school…

  64. Sergio Medina February 14, 2020 at 4:58 pm

    Nobody’s going wild dat kangaroos can PAUSE their pregnancy 🤦‍♂️

  65. miriai chan February 14, 2020 at 5:28 pm

    Weeks days ago i had a fight with my friends if the platupus is a mamal that. Lays eggs or just normal birth and is it even a mamal welp looks like i win the argument 😂😂😂

  66. APPLE CIDER February 15, 2020 at 9:16 am


  67. Jessica Parada February 17, 2020 at 1:00 am


  68. Ruby Rembiszewski February 17, 2020 at 2:28 am

    imagine milk SEEPING from your pores

  69. Rifai Muhammad February 17, 2020 at 11:10 am

    Mamal lay eggs?
    This is the first time i hear it since 30 years life

  70. Connor Her February 19, 2020 at 1:47 am

    The one thing all things have in common is that they are alive

  71. Abdulwadood Haneef February 19, 2020 at 1:29 pm

    Is this biology class

  72. Lilac Cloud February 20, 2020 at 3:07 am

    Blue whales giving birth is like a cargo ship giving birth to a life boat

  73. Emily Hane February 20, 2020 at 8:33 pm

    That blue whale looks like she’s seen things…

  74. Scythela February 21, 2020 at 6:01 am

    excuse me? kangaroos have THREE VAGINAS??

  75. Himanshu HR February 21, 2020 at 3:23 pm

    Mammalia is not a kingdiom

  76. callum hardy February 21, 2020 at 5:59 pm

    Bananas are marsupials. You forgot that one.

  77. sir lee February 22, 2020 at 12:16 am


  78. 2sday February 22, 2020 at 4:54 am

    Bro that blue whale gave birth to a shiny

  79. Evercreeper February 23, 2020 at 5:46 am

    Actually there is only 1 way. It’s called

    b a b y e x i s t o

  80. 7 DusK February 24, 2020 at 1:49 am

    Kate Slaboski sounds just like Katie Merovich.

  81. Not me February 24, 2020 at 4:10 am

    Why wasn’t the Platypus in the Thumbnail?

  82. Giganus terror February 25, 2020 at 1:09 pm

    Did whale have hair on their body?

  83. hritik pawar February 25, 2020 at 2:11 pm

    Just add this video in our education please

  84. Phantom Miser February 26, 2020 at 6:55 am

    now i can learn so much stuff because of this video

  85. BtwImReal February 26, 2020 at 9:49 am


  86. Deez_Newts February 26, 2020 at 8:56 pm

    2:37 Please don't take this out of context or commentary

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