A nontoxic dye highlights water currents surrounding sea urchins (Astropyga sp.) off Vancouver Island, British Columbia. These small, spiny echinoderms are found in oceans all over the world.

• 意译：海胆类：在自然界模式。一个无毒的染料高光点水流周围的海胆类离开温哥华岛，不列颠哥伦比亚。这些小的，多刺的棘皮动物在全世界海洋能找到。