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start:life_sciences:biology:whale_spermaceti

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Whale spermaceti organ

The spermaceti organ in the heads of sperm whales produces a waxy substance ('whale oil'). It's also produced in smaller quantities in other whale species.

There are three main theories regarding possible function(s).

1) As an adjustable buoyancy device
2) As a buffer in collisions
3) As an echo resonator

No theory has been agreed upon.

See: Wikipedia

Note: More detail and references required

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