2nd, seen three of these, they are like an oval shape, tentacle eyes by the look of it, dark camouflage pattern but when they are in the dark their back kind of opens up revealing a shiny white underneath (almost looks like a shell) once you shine a torch on them, they close back up. I guess about an inch in size. Again, an id and are they dodgy. They seem to just move around the glass, and hide somewhere during lights on.