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TED-Ed

Why do humans have a third eyelid? - Dorsa Amin

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7,009 Questions Answered

TEDEd Animation

Let’s Begin…

You know that little pink thing nestled in the corner of your eye? It’s actually the remnant of a third eyelid. In humans, it’s vestigial, meaning it no longer serves its original purpose. There are several other vestigial structures in the human body, quietly riding along from one of our ancestor species to the next. But why have they stuck around for so long? Dorsa Amir investigates.

Watch the video and finish the Think section to complete the lesson.


About TED-Ed Animations

TED-Ed Animations feature the words and ideas of educators brought to life by professional animators. Are you an educator or animator interested in creating a TED-Ed Animation? Nominate yourself here »

Meet The Creators

Educator
Dorsa Amir
Director
Avi Ofer
Narrator
Addison Anderson
Animator
Avi Ofer
Illustrator
Avi Ofer
Director of Production
Gerta Xhelo
Editorial Producer
Alex Rosenthal
Associate Producer
Bethany Cutmore-Scott
Associate Editorial Producer
Elizabeth Cox
Script Editor
Emma Bryce

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