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420 million years ago, some fish were more medieval. They wore armor, sometimes made of big plates, and sometimes made of interlocking scales. But that armor may actually have served a totally different purpose, one that many animals still use today.
First Air Date : Jun 26, 2017
Last Air date : Oct 14, 2022
Episode : 246 Episode
Season : 6 Season
Runtime: 10:14 minutes
Studio: PBS Digital Studios, YouTube
Country: United States of America
Crew:
