Have a look - Tetrads! I am lax in not bringing you more of these, they are out there!
My favorite though is Tardigrades! (Catchy tune to augment the video!)
https://www.youtube.com/watch?v=IH3ABle9k7A
I don't think I did a link to the wastewater variety from TPO though. So in case I didn't - here it is!
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