Sea otters use tools to open hard-shelled prey, saving their teeth, research reveals - The Guardian
- Sea otters use tools to open hard-shelled prey, saving their teeth, research reveals The Guardian
- In California, otters are turning to tools to eat prey in Monterey Bay Yahoo News UK
- Otters, Especially Females, Use Tools To Survive a Changing World College of Natural Sciences
- Sea otters use natural tools to help take care of their teeth: study Sunnyside Sun
- Female sea otters use tools more than males Popular Science