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Science 3: Mass Extinction of Dinosaurs 19 Views


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Description:

Keep a stiff upper lip, Shmoopers. Today's lesson is about how all the dinosaurs died. Before we got to ride any of them. Even once.

Language:
English Language

Transcript

00:04

[Coop and Dino singing]

00:13

Dinosaurs were magnificent creatures... [Dinosaurs in a field]

00:16

Majestic...

00:17

Elegant...

00:18

And uh…sometimes pretty darn scary. [T-Rex appears]

00:20

So while it's definitely pretty sad that they aren't around today for us to enjoy, we all

00:24

might be a little better off without this...

00:26

Or this...

00:27

Or this...

00:28

Or swarms of these running around. [Dinosaurs tormenting guys on a bike]

00:31

But as grateful as we are to not have to worry about being some dino's afternoon snack…

00:36

…what happened?

00:37

Why are they gone?

00:38

Well, scientists believe a massive extinction of dinosaurs occurred around 66 million years ago. [Scientist working in a lab]

00:44

But while scientists agree that this extinction definitely happened, they disagree on exactly [Dinosaur disappears off a cliff]

00:49

how it went down.

00:50

For example, one popular theory is that an asteroid hit the earth around this time, wiping

00:54

out all of the dinosaurs on the planet. [Asteroid hitting earth]

00:56

Another theory is that instead of an asteroid, it was actually volcanoes throughout a large

01:01

area in India that caused the dinosaurs to go extinct, erupting over a period of thousands [Volcano erupting]

01:06

of years.

01:07

Yeesh…maybe someone should've given those volcanoes a Snickers….they're not themselves

01:11

when they're hungry.

01:12

Another theory is that the earth kept getting colder and colder, and because dinosaurs are [Dinosaurs shaking with cold]

01:16

cold-blooded, and electric blankets weren't invented yet, they weren't able to survive.

01:21

And some scientists think, "Hey, the more theories, the merrier," and think it was some

01:26

sort of combination of all three that led to the extinction of the dinosaurs.

01:29

But regardless of how it happened, we know that 70% of the animals that lived at this

01:33

time went extinct.

01:35

The remaining 30% of animals that survived included small rodent mammals, crocodiles, [A rodent, crocodile and a bird appear]

01:40

and some birds.

01:41

So yeah, it was a pretty tough time for life on earth.

01:45

The only time period that was scarier?

01:46

The '80s…seriously, the clothing… the hair do's.. [Man thinks about the 80's time period]

01:51

But it doesn't necessarily take a giant meteor or a series of volcanoes to cause a species

01:56

to go extinct.

01:57

You've probably heard of plenty of animals that are endangered or going extinct even [A polar bear laying on a rock]

02:01

today.

02:02

Recent examples of animal species that have gone extinct include the Javan Tiger,

02:05

the Golden Toad, and the Passenger Pigeon.

02:08

And there are many more species that are critically endangered and nearing extinction, including [A baboon crying]

02:12

the Black Rhino, the Mountain Gorilla, the Bengal Tiger, and the Leatherback Turtle.

02:17

What's worse is that many species are endangered because of us. [A bear dead on a log and a man appears]

02:21

Humans are either hunting them or destroying their habitats.

02:23

Yup.

02:24

Some humans can be the worst.

02:26

That's why it's so important that we do our best to protect all species of plants and

02:30

animals in order to keep them alive and well for years to come. [Monkey family protecting a young monkey]

02:33

And in case you still need to be convinced, just look at this photo of a baby leatherback turtle.

02:39

How can you say no to that face? [Hand holding a small leatherback turtle]

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