Can you identify this approximately 1.5inch critter. it looks like a 'pile' of small worms, but moves like a slug. i have seen three of these on separate occasions in the morning following rain when the ground is wet. The 'individual worms' seem to move independently of the total mass.
This is a neat find, which we tend to see during wet years.
It is a congregation of the larvae of the darkwing fungus gnat.
If a large number of eggs hatch near each other and the larvae can migrate en masse, forming snake-like line crawling atop each other.
These are most often noticed when moving across a sidewalk or driveway. It is rarely of any consequence in the landscape.