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Oh
I just read this article about sperm whales.
Swipe to see the organ better.
These whales have this massive head that’s full of spermaceti oil, which is a blend of triacylglycerols and waxes. It’s crazy how this oil changes with temperature—it’s liquid when the whale is at the warm surface, but it starts to solidify when they dive deep where it’s colder. This helps the whale control its buoyancy, adjusting its density to match the water around it so it can chill in deep water waiting for squid to swim by.
Such an amazing adaptation!
It’s like nature’s own custom buoyancy control system. But it’s sad because people used to hunt them for this oil, which put them on the endangered species list. We need to protect these incredible creatures!