Yes, a Stegosaurus' tail spikes are actually called the "Thagomizer", and here's the actual who-what-when-where...and most importantly...WHY! :D

https://www.hmns.org/

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Triceratops feather/quill video mentioned
https://youtu.be/kEmnVd0KHx0

For more information about the Houston Museum of Natural Science, visit https://www.hmns.org/