human vs tyranosaurus arm

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Here's a screenshot from one of the video lectures for Dino 101.

Isn't this cool?  It's a cast of a real tyranosaurus arm.  The humerus, ulna, and radius look like they are about the same length as the same bones in the lecturer's arms!  (as always, click on an image to embiggen)

How cool, to see human arms holding a dino arm -- you get an excellent sense of relative size....

The combined metacarpals are longer than the ulna and radius!

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