Most invertebrates live in the ocean. They are well suited to living in the ocean because they can float easily since they don't have any bones. Some good examples include jellyfish, squid, and sea cucumbers, which have soft bodies. Some invertebrates, like crabs, prawns, and sea urchins, have hardened exteriors to protect them. Some invertebrates live on land such as spiders, bees, worms, and slugs.