Insect and Spider Identification: CLOSED: What is this thing?, 0 by Plants4myPots

Plants4myPots wrote:
I thought it was a shell or a cocoon of some sort... but it wiggles it's tail! I took some video of it wiggling, but you'll have to guess from the pic.

Found it when I was dumping out spent containers... so I think it could be whatever ruined my struggling strawberry plants? I didn't squish it after I took the pics, but I did put it in a small container with a bit of dirt and a piece of mesh tied over the top so I can see if it turns into anything...