AgrarianContrarian on Nostr: ...

quoting nevent1q…h9px

Common in most fowl actually, especially those with a gizzard. Although most fowl need pebbles much smaller than this.

Kinda like tumbling spent cartridges to clean brass before reloading. The tumbler being the gizzard that needs the aggregate and the reloading being the "true" stomach that requires microbes.