The Tyrannosaurs Rex grew up to 20 feet tall, yet their front arms were roughly the size of human arms—hardly proportional! Viewers see how the front limbs became smaller over the course of millions of years. PBS Eons goes on to explain how the arms worked and possible uses from hugging to attacking.

Concepts

tyrannosaurus rex, evolution

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Additional Tags

science

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Instructional Ideas

• Add new vocabulary to science journals
• Act out the proper hand movements of a T-Rex

Classroom Considerations

• Content ends at 6:47, and the remaining time is an advertisement

• This video is hosted on YouTube

Pros

• Provides closed captioning for English learners
• Includes a long list of references

Cons

• None

Common Core

SL.6.2 SL.7.2 SL.8.2 SL.9-10.2 SL.11-12.2 RST.6-8.4 RST.9-10.4 RST.11-12.4