Hi Tia
I read about your latest question and I think I know how glowworms glow Ithink they have a speical thing on their tail that always glows but you can't see it in the light you can only see it glow in the dark. By the way I have been to waitomo caves and I saw some glowworms there they are pretty cool and their glow is cool too.If you want to have a look at a glowworm go to this page glowworms
From Hayley.