Breadcrumb Home Ocean Life Invertebrates A Sponge Crab's Updo A Sponge Crab's Updo (Okinawa Nature Photography, Flickr) The sponge on this crab's back is more than a stylish accessory. The sponges are great camouflage with the added benefit of toxins and chemicals that deter predators. Tags: Crabs, Shrimp & Relatives Sponges January 2018