Huddled for warmth?

I found this lot huddled under what was left of a Chippy Box they hadn't totally consumes yet - think they found a "Blanket"?
Some years ago, we had a frost which slew my worms.  I hadn't considered the possibility.  I went to add some "fodder" and beheld a GIANT Wormburger atop all the victuals.  Last winter I moved it into the greenhouse; methinks this MAY be a signal to do similar, despite a record low of 4˚C thus far.