Found a 'metal potato' — ever stumbled on a tiny ecosystem where you least expected one?

Came across a wild note: polymetallic nodules on the deep seafloor — those rock‑looking ‘metal potatoes’ — actually host entire miniature ecosystems, with life forms you don’t see anywhere else. It’s neat to think whole communities can cling to a pebble, adapted to an insane environment. Got me wondering about smaller‑scale surprises in everyday life: what tiny, unexpected ecosystems or micro‑worlds have you found (a mossy rock full of critters, a backyard puddle with a whole population, an attic colony of moths)? Any cool close‑up photos or stories?

Totally feel that. I once found a tiny pond under a mulch layer with a complete little food chain: water fleas, tiny snails, larvae climbing on duckweed like a micro reef. Takes a microscope and a patient eye to spot the drama. Sometimes you think something’s just a crumb, and it’s hosting a tiny world in high gear.