Deepwater feather stars, or crinoids, are rarely found in such abundance on the seafloor as seen in this video. On this dive, we came across a dense field of feather stars, some being grazed upon by cidaroid urchins, one of their dominant predators. If necessary, some crinoids are capable of swimming short distances to escape predators or find better locations to feed. They do this by undulating their arms in a mesmerizing manner, gaining some distance above the seafloor, and gliding downward to a soft landing.