this post was submitted on 24 Apr 2025
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[–] NONE_dc@lemmy.world 62 points 2 weeks ago (2 children)

Me: Is that true?

Search a little

Me: Oh my god...

[–] tetris11@lemmy.ml 57 points 2 weeks ago* (last edited 2 weeks ago) (3 children)

https://ocean.si.edu/ocean-life/fish/tough-teeth-and-parrotfish-poop

In a year, one large parrotfish can produce 1,000 pounds (450 kg) of sand, the weight of a baby grand piano.

Most of the sand comes from waves sloshing onto rocks though, right? right?

[–] PotatoesFall@discuss.tchncs.de 35 points 2 weeks ago (2 children)

most of the sand is eroded inland and deposited by rivers

[–] tetris11@lemmy.ml 12 points 2 weeks ago* (last edited 2 weeks ago)

Thank fuck for that!

[–] shalafi@lemmy.world 12 points 2 weeks ago

Depends entirely on where you're at. Our coastal beaches are pure white and sound like popcorn (fish eating) when you're underwater near coral.

The beaches along the rivers can be brown sand, washed down as you say, but some are pebbles instead. Never understood how two rivers so close together ended up with such different beaches.

[–] FooBarrington@lemmy.world 27 points 2 weeks ago

I had never thought about the reproductive cycles of grand pianos, fascinating

[–] ch00f@lemmy.world 4 points 2 weeks ago* (last edited 2 weeks ago)
[–] chuckleslord@lemmy.world 5 points 2 weeks ago

Ya know that sound that you can hear under the water at white sand beaches? Sound like sand being ground through a bearing? Or a neck joint pressurizing? Yeah, that's the parrot fish... happily eating away.