When Did Animals Start Giving Birth to Live Young? This 236-Million-Year-Old Fossil Might Rewrite Mammals' Evolutionary History

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https://www.smithsonianmag.com/smart-news/when-did-animals-start-giving-birth-to-live-young-this-236-million-year-old-fossil-might-rewrite-mammals-evolutionary-history-180989343/

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mammals9x no texto
“One theory suggests that mammals became viviparous, or birthed live babies, only in recent evolutionary history.”
TermoTradução
Frase de exemploOne theory suggests that mammals became viviparous, or birthed live babies, only in recent evolutionary history.
evolutionary6x no texto
“One theory suggests that mammals became viviparous, or birthed live babies, only in recent evolutionary history.”
TermoTradução
Frase de exemploOne theory suggests that mammals became viviparous, or birthed live babies, only in recent evolutionary history.
creature6x no texto
“, 2026 under CC BY 4.0 To investigate this line of thought, the team used the creature’s bone measurements and the neonatal line to deduce its weight at birth and death.”
TermoTradução
Frase de exemplo, 2026 under CC BY 4.0 To investigate this line of thought, the team used the creature’s bone measurements and the neonatal line to deduce its weight at birth and death.
fossil5x no texto
““We’ll need more fossil evidence to test these two hypotheses,” he tells Science News ’ Carolyn Gramling.”
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Frase de exemplo“We’ll need more fossil evidence to test these two hypotheses,” he tells Science News ’ Carolyn Gramling.
evidence5x no texto
“The indirect evidence of live birth suggests that the reproductive process was taking place around 95 million years earlier than scientists previously thought.”
TermoTradução
Frase de exemploThe indirect evidence of live birth suggests that the reproductive process was taking place around 95 million years earlier than scientists previously thought.
pounds5x no texto
“theotonicus, around 17.6 to 33.1 pounds, have a newborn-to-adult body mass ratio of up to nearly 19 percent—similar to the calculation for the extinct creature, the team found.”
TermoTradução
Frase de exemplotheotonicus, around 17.6 to 33.1 pounds, have a newborn-to-adult body mass ratio of up to nearly 19 percent—similar to the calculation for the extinct creature, the team found.
mass5x no texto
“It would have come into the world at about 3.7 pounds and died at around 26.4 pounds, translating to a 14 percent newborn-to-adult body mass ratio.”
TermoTradução
Frase de exemploIt would have come into the world at about 3.7 pounds and died at around 26.4 pounds, translating to a 14 percent newborn-to-adult body mass ratio.
ratio5x no texto
“They then compared the ratio to that of living animals: 1869 mammals, 2619 reptiles and 782 birds.”
TermoTradução
Frase de exemploThey then compared the ratio to that of living animals: 1869 mammals, 2619 reptiles and 782 birds.
animals4x no texto
“They then compared the ratio to that of living animals: 1869 mammals, 2619 reptiles and 782 birds.”
TermoTradução
Frase de exemploThey then compared the ratio to that of living animals: 1869 mammals, 2619 reptiles and 782 birds.
found4x no texto
“You Might Also Like This Couple Found a Mysterious 150-Pound Sculpture Buried in Their Backyard.”
TermoTradução
Frase de exemploYou Might Also Like This Couple Found a Mysterious 150-Pound Sculpture Buried in Their Backyard.
mammal4x no texto
“Quick fact: Mammal exceptions The only living mammals that lay eggs are called monotremes .”
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Frase de exemploQuick fact: Mammal exceptions The only living mammals that lay eggs are called monotremes .
relatively4x no texto
“Living mammals, on the other hand, have relatively big babies.”
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Frase de exemploLiving mammals, on the other hand, have relatively big babies.
eggs4x no texto
“Quick fact: Mammal exceptions The only living mammals that lay eggs are called monotremes .”
TermoTradução
Frase de exemploQuick fact: Mammal exceptions The only living mammals that lay eggs are called monotremes .
researchers4x no texto
“They were the ancestors of the first true mammals, and many researchers suspected that all non-mammalian cynodonts were oviparous, meaning they laid eggs.”
TermoTradução
Frase de exemploThey were the ancestors of the first true mammals, and many researchers suspected that all non-mammalian cynodonts were oviparous, meaning they laid eggs.
research4x no texto
““When you are in an egg or in your mom’s belly, you have a small space and you grow very slowly,” study co-author Leandro Gaetano , a paleontologist at Argentina’s National Scientific and Technical Research Council, tells Live Science ’s Chris Simms.”
TermoTradução
Frase de exemplo“When you are in an egg or in your mom’s belly, you have a small space and you grow very slowly,” study co-author Leandro Gaetano , a paleontologist at Argentina’s National Scientific and Technical Research Council, tells Live Science ’s Chris Simms.
tells4x no texto
““We’ll need more fossil evidence to test these two hypotheses,” he tells Science News ’ Carolyn Gramling.”
TermoTradução
Frase de exemplo“We’ll need more fossil evidence to test these two hypotheses,” he tells Science News ’ Carolyn Gramling.
percent4x no texto
“theotonicus, around 17.6 to 33.1 pounds, have a newborn-to-adult body mass ratio of up to nearly 19 percent—similar to the calculation for the extinct creature, the team found.”
TermoTradução
Frase de exemplotheotonicus, around 17.6 to 33.1 pounds, have a newborn-to-adult body mass ratio of up to nearly 19 percent—similar to the calculation for the extinct creature, the team found.
giving3x no texto
“When Did Animals Start Giving Birth to Live Young?”
TermoTradução
Frase de exemploWhen Did Animals Start Giving Birth to Live Young?
million-year-old3x no texto
“This 236-Million-Year-Old Fossil Might Rewrite Mammals’ Evolutionary History A bone feature found in a mammal ancestor hints that the creature was relatively large as a newborn, more in line with the size of a creature birthed live than hatched from an egg.”
TermoTradução
Frase de exemploThis 236-Million-Year-Old Fossil Might Rewrite Mammals’ Evolutionary History A bone feature found in a mammal ancestor hints that the creature was relatively large as a newborn, more in line with the size of a creature birthed live than hatched from an egg.
renew3x no texto
“This 236-Million-Year-Old Fossil Might Rewrite Mammals' Evolutionary History Skip to main content Search Shop Newsletters Renew Give a Gift Subscribe Membership i Subscribe Give a Gift Renew Sections Smart News History Science Innovation Arts & Culture Travel At the Smithsonian More from Smithsonian magazine Newsletters Photo Contest Podcast Videos Our Partners Smithsonian Store Smithsonian Journeys Subscribe to Smithsonian magazine and get a FREE tote.”
TermoTradução
Frase de exemploThis 236-Million-Year-Old Fossil Might Rewrite Mammals' Evolutionary History Skip to main content Search Shop Newsletters Renew Give a Gift Subscribe Membership i Subscribe Give a Gift Renew Sections Smart News History Science Innovation Arts & Culture Travel At the Smithsonian More from Smithsonian magazine Newsletters Photo Contest Podcast Videos Our Partners Smithsonian Store Smithsonian Journeys Subscribe to Smithsonian magazine and get a FREE tote.
birthed3x no texto
“One theory suggests that mammals became viviparous, or birthed live babies, only in recent evolutionary history.”
TermoTradução
Frase de exemploOne theory suggests that mammals became viviparous, or birthed live babies, only in recent evolutionary history.
indirect3x no texto
“The indirect evidence of live birth suggests that the reproductive process was taking place around 95 million years earlier than scientists previously thought.”
TermoTradução
Frase de exemploThe indirect evidence of live birth suggests that the reproductive process was taking place around 95 million years earlier than scientists previously thought.
mammalian3x no texto
“However, scientists are unsure of when exactly this characteristic emerged in the mammalian lineage.”
TermoTradução
Frase de exemploHowever, scientists are unsure of when exactly this characteristic emerged in the mammalian lineage.
growth3x no texto
“Further analyses revealed that the feature was a neonatal line—a growth mark akin to a tree ring—that can form in bones or teeth when newborns experience a growth spurt right after birth.”
TermoTradução
Frase de exemploFurther analyses revealed that the feature was a neonatal line—a growth mark akin to a tree ring—that can form in bones or teeth when newborns experience a growth spurt right after birth.