Earthworms are a gatherable non-plant. They are technically edible, but serve better as fishing bait.

Ingame description:

This is a fat pink worm about half a handspan long, its skin slick with slime.
Both ends taper to blunt points; a raised cuff of paler flesh encircles the worm
beneath what is presumably its head. Its ridge-covered body is no thicker than
a blade of grass. The worm is still alive, though hardly capable of evading a
dedicated hand.

When Spring Summer Fall Winter
Where light forest heavy forest plains hills mountains marsh desert swamp
Documentation notes: Not sure which terrain types and seasons this is found in the ones already listed (but findable in winter): check them all when you have time
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