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Cyclopath
Faster than light



Joined: 20 Mar 2012
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Location: Seattle
Cyclopath
Faster than light
PostThu Oct 20, 2022 7:21 pm 
This is cool and weird. Sharks have rough skin, it was used as sand paper in preindustrial times. Open ocean fish have no arms to remove parasites, so they rub themselves on sharks. They pick on sharks their own size to stay off the menu, and different kinds of fish have different ways of doing it: "Tunas were quite orderly, lining up behind the shark and taking turns to brush against the tail. Rainbow runners were unruly, forming a school around the back half of the shark and darting out in turns to bump against its body." https://www.sciencealert.com/tuna-have-been-seen-rubbing-themselves-against-sharks-and-we-dont-blame-them

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Ski
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Joined: 27 May 2005
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Location: tacoma
Ski
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PostThu Oct 20, 2022 7:51 pm 
sharkskin was used for years for sandpaper.

"I shall wear white flannel trousers, and walk upon the beach. I have heard the mermaids singing, each to each."
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