A well-intentioned human helpfully provided a picky little hermit crab on the beach with a number of shells from which to choose the perfect new home.
This is a very common behavior with hermit crabs, who change shells as they grow larger.
Upgrading shells is critical to hermit crabs as they grow. And in any hot real estate market, the competition is fierce for the best properties. Check out the incredible choreography of move in day as several crabs simultaneously make big upgrades.