00:00This otter just used a tool to open its dinner.
00:03And it's carried that same rock for years.
00:08Sea otters are one of the few marine mammals known to use tools,
00:12and many keep a favorite rock tucked in a loose pouch of skin under their arm.
00:20That same rock might be used again tomorrow.
00:23A tool this useful is worth holding onto.
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