Fireflies and hermit crabs

Set up camp tonight under a tree on the edge of a beach on ko lanta island. I have the entire beach to myself!
Soon as I started relaxing by the fire I noticed fireflies. I started flashing them with my flashlight and some of them landed on a branch above me, just blinking away.
Next I went beachcombing and I saw a huge shell like I've never seen before before I could grab it though I suddenly noticed it had a hermit crab in it. That when I noticed them everywhere. Hermit crabs back home are tiny but these are huge!