this post was submitted on 24 Apr 2025
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[–] tetris11@lemmy.ml 57 points 2 days ago* (last edited 2 days 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?

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

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

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

most of the sand is eroded inland and deposited by rivers

[–] shalafi@lemmy.world 12 points 2 days 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.

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

Thank fuck for that!

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