A white scarab dissolves its glass cage and is trapped under a plastic cup, then several scarabs feed on wood, metal, glass, and dirt.

Panel 1: Caption: The scarab's skin became slightly clear,
Panel 2: Caption: and the glass dissolved.
Panel 3: Caption: The scarab began devouring glass until we trapped the scarab in a plastic cup.
Panel 4: Caption: We tested many scarabs after that, letting them eat different things.
Caption: The scarabs would always get really hungry and eat whatever they could get to first.
Caption: Wood,
Caption: Metal,
Caption: Glass,
Caption: Dirt,
Caption: Ravaging hunger for that specific thing, and the ability to dissolve it into an edible mush.