Moby Dick
by Herman Melville
You know the plot. I reread (relistened) to this book. The sperm whale is amazing. I want to look at a CT (CAT scan) of this animal to see what it looks like. the head is one third of the length of the body. The spermaceti fills a large portion of the head. Cold water is circulated through the spermaceti organs, which solidified this waxy substance. The spermaceti has increased density, decreased buoyancy, and helps the whale to dive. During the dive, metabolic heat melts the spermaceti, increasing its volume, decreasing its density and increasing the buoyancy. It also stores oxygen. Cool metabolism.
Wiki is amazing.
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