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. LIFE STORY concludes SAT 9/8c on Discovery. | http://www.discovery.com/tv-shows/life-story/ Subscribe to Discovery: http://www.youtube.com/subscription_center?add_user=discoverynetworks Join us on Facebook: https://www.facebook.com/Discovery Follow on Twitter: https://twitter.com/Discovery Check out the Test Tube App: http://testu.be/1ndmmMq"