During a recent dive in Mucky Pirates Bay, I came across an upside-down jellyfish lying in the sand. I wasn’t sure whether it was alive or dead, so I gently prodded it with my muck stick. Imagine my surprise when it started running across the sand! What I didn’t realize was that there was a decorator crab underneath who had adorned this jellyfish like a hat to protect itself from predators. I found another one on a subsequent dive, so this must be fairly common. It’s clear what benefit the crab gets from this relationship…not sure if the jellyfish is too happy about the arrangement.
