Here’s what sperm whales look like when they’re sleeping

5 Replies to “Here’s what sperm whales look like when they’re sleeping”

1. This Article was mentioned on brid.gy

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2. This Article was mentioned on brid.gy

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3. This Article was mentioned on brid.gy

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4. @mathewi They can sleep underwater without breathing?

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5. This Article was mentioned on brid.gy

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