I'd embed the video, but it's disabled. The video shows a clip from a BBC doc about weird nature. In it, they show crabs that use fabric and other items to dress themselves, providing important camoflauge from their predators.
It's pretty funny watching the crabs get their items "just right" ..patting down the fabric hear..puffing it up there...and then putting on pearls for the finishing touch.
I call it a contest because in the most basic sense of the word, it is exactly that. The crab that dresses the worst will probably be killed.