gross

I just took down a poster and in the sticky tape on the back of the thing were three larvae or maggots or something developing as I peeled the tape areas off. Upon taking it down fully I also found a huge dead moth squeezed behind it (the poster wasn't entirely snug to the wall throughout, so it's not as if you saw a moth bulge on the visible side). So maybe the other critters were the moth's offspring. Alternatively two different vermin populations are interested in the backside of posters as habitat.

I find this actually somewhat grosser than finding insects colonizing my foodstuff as opportunity. You anticipate your food to be attractive and watch out for that, but tape being attractive seems entirely random. I guess anything is edible to someone.