Why Fiddler Crabs Have Such Giant Claws

They're more than just massive weapons.


Watch "Extreme Animal Weapons" on PBS at: http://www.pbs.org/wgbh/nova/nature/e...

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PRODUCTION CREDITS

Digital Producer:
Arlo Perez

Editorial Review:
Julia Cort, Ari Daniel

© WGBH Educational Foundation 2018

MEDIA CREDITS

Music:
APM