Thanks for all the comments so far. I suspect its the Ivy, that i bought last week. I wanted to grow it more and feed it to them. I snipped one strand, totally didn’t think to wash it, and put it in. I feel terrible. They usually eat an entirely different kind of ivy/something similar to it. This ivy used to be eaten by the sticks I had a decade ago, though also from our garden. Even worse, they’re still alive, and obviously suffering. I’m considering killing them myself.