Name: 4 Things You Got Wrong About Dinosaurs
Uploaded: 2021-04-17T13:41:40.000Z
Duration: 4 min 26 s
Description: VoiceTubeの動画で発音を聞きながら英語表現を覚えよう！学べる英語：

Sorry not sorry, that was kind of lame, but it got us talking about dinosaurs!

The prehistoric reptiles fascinate almost all of us at some point.

But let's run down a few of the things you might not know about them.

Let's just get this one out of the way first… humans and dinosaurs never coexisted.

The earliest human fossil we know of dates around 2.8 million years ago.

whereas the dinosaurs went exist like 65 million years ago.

But there were little proto-mammals running around with dinosaurs for nearly 150 million

Some little guys looked like mice and weighed as little as 2 grams.

(Not it didn't cause their extinction) But one study published in the journal Nature

described two species, that dined on dinosaurs.

Repenomamus giganticus and Repenomamus robustus, lived in China about 130 million years ago.

Like its name suggests, R. Giganticus, was pretty big for an early mammal, at about 3

Speaking of big things, some giant Pterosaurs have wingspans over 30 feet long!

Dinosaurs are terrestrial reptiles, so by definition, pterosaurs, a flying reptile,

They did co-exist, but they are separate groups descended from a common ancestor.

According to Smithsonian magazine, “pterosaur is no more a dinosaur than a goldfish is a

And one study published in the journal PLOS One found that they didn't use their legs

to push off the ground, they used their wings!

They would run down hill, into a head wind and launch themselves, like a pole vaulter,

We know A LOT about dinosaurs, but there are some really enigmatic mysteries that remain.

Unfortunately soft tissue doesn't fossilize all that well, so we don't have an exact

Although a recent discovery shed some light on dino sounds.

A new species of “terror bird” describe in the Journal of Vertebrate Paleontology

was found with a nearly complete skeleton… including voice box!

The researchers think that it used a narrow, low vocalization frequency range, to possibly

Sounds pretty cool and could be the topic of a whole 'nother episode ...and maybe

if you were a subscriber you wouldn't miss that episode!

Last but not least..we still don't know what killed the dinosaurs.

I mean yeah, we've narrowed it down pretty close.

The KT event happened 65 million years ago, when an asteroid struck what is now the Yucatan

But my favorite hypothesis is that a global firestorm flash fried the dinosaurs.

I mean a lot of species were already on their way out when the asteroid hit.

One study published in the journal Nature suggests that a series of crazy volcanic eruptions

that started started 250,000 before the asteroid hit, might have killed a lot of them off.

A few years ago, a study published in the Journal of Geophysical Research found that

when the asteroid hit it kicked up a lot dirt into the Earth's atmosphere.

With as much force as 100 trillion tons of TNT.

As the debris rained back down it could have heated the upper atmosphere to 2,700 degrees

It might have also caused a devastating winter like planet where nothing green could grow

so all the dinosaurs starved over months or years.

OOORRRR this theory suggests that it kicked off a world wide fire storm and the dinosaurs

But versions of this story are over ten years old, one first appeared in the Bulletin of

the Geological Society of America in 2004.

Since then, some holes have been poked in it, like one study published in Journal of

the Geological Society found that fire storms weren't worldwide.

The heat pulses from the impact wouldn't have set nearby plants on fire, but could

have done some damage to those further away from the impact site.

Personally, I kind of like the idea that what killed the dinosaurs still remains a mystery.

It's one of the most enduring, and frankly fun mysteries in science.

Scientists learn new stuff all the time about dinosaurs.. sometimes they even re-learn old

Check out Crystal as she explains why the name “brontosaurus” could be making a

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4 Things You Got Wrong About Dinosaurs

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