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Sperm whale fluke

A sperm whale’s fluke, just before it dives deep into the ocean to feed. The flukes are flexible, able to move up and down, helping to propel the whale through the water.
Photo by Bernard Spragg.

A sperm whale’s fluke, just before it dives deep into the ocean to feed. The flukes are flexible, able to move up and down, helping to propel the whale through the water.
Photo by Bernard Spragg.