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Terrible Hand: Mystery

This document discusses Deinocheirus, a dinosaur discovered in Mongolia in the 1960s based only on a pair of giant arms. Paleontologists have debated what this dinosaur may have looked like based on the size of its arms. Some estimates suggest its body was almost 12 meters long, similar in size to a T-Rex. However, others believe Deinocheirus was smaller with extremely long arms, but its exact appearance remains a mystery without more fossil evidence.

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Sophia Vu
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308 views1 page

Terrible Hand: Mystery

This document discusses Deinocheirus, a dinosaur discovered in Mongolia in the 1960s based only on a pair of giant arms. Paleontologists have debated what this dinosaur may have looked like based on the size of its arms. Some estimates suggest its body was almost 12 meters long, similar in size to a T-Rex. However, others believe Deinocheirus was smaller with extremely long arms, but its exact appearance remains a mystery without more fossil evidence.

Uploaded by

Sophia Vu
Copyright
© © All Rights Reserved
We take content rights seriously. If you suspect this is your content, claim it here.
Available Formats
Download as PDF, TXT or read online on Scribd
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Did you Know?

Mystery of the Today, China and Argentina


are “hot spots” for
important dinosaur

Terrible Hand
discoveries.

1 Name: Deinocheirus
Lived when: 70 million years ago
Discovered where: Mongolia

Whose arms are these? Paleontologists have sought


5 an answer to this question for almost forty years.
In the 1960s, paleontologists unearthed a pair
of giant arms in Mongolia.The length of
each, when fully extended, was 2.4 meters
(eight feet). The claws were 26 centimeters
10 (ten inches) long. Paleontologists called the
animal Deinocheirus (meaning “terrible hand”).

So what did this animal look like? Paleontologists


aren’t sure. Many times, scientists have examined the area
where they found the arms. But since the original discovery, Deinocheirus: the body
15 they have unearthed only a few other bones of this dinosaur. is a mystery.

Despite this, scientists have some ideas about Deinocheirus’s


appearance. Physically, this animal’s arms and hands are
similar to ornithomimids—a type of dinosaur that looked like a
modern-day ostrich1 and used its arms for catching food. But
20 when paleontologists use the size of Deinocheirus’s arms to try
to estimate the size of its body, it seems to have been a huge
animal—almost 12 meters (40 feet) long. This is almost as big
as a T. rex!

Other scientists have a different opinion. They think


25 Deinocheirus was a smaller dinosaur with extremely long arms.
But why would a little animal need limbs2 so long? To climb
trees or to hunt for food, perhaps? “The body is a mystery,”
says Thomas Holtz, a paleontologist at the University of Was Deinocheirus
a huge animal?
Maryland in the U.S. “It might not be an ornithomimid at all.
30 But then what is it?” Until paleontologists find new fossil
evidence, this question remains unanswered.
5

1
An ostrich is a very large bird that cannot fly.
2
Your limbs are your arms and legs.

7B Strange dinosaurs 7

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