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Dolphins are mammals- so they have lungs, and breathe air through a 'blowhole' on top of their head. They do not have gills like the fishes.

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12y ago
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7y ago

Being mammals - they lack the swim bladder that fish have. They simply use their tails to 'steer' themselves down or up.

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Q: How do whales sink or rise at their own will?
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