And Youさんのインスタグラム写真 - (And YouInstagram)「Heterocentrotus mamillatus..... (or for the non marine biologists, the Pencil Urchin) generally comes out at night to feed, moving around using their hard, horned teeth to scrape algae and other plant matter off rocks and corals. . . . . . . . . . . . . . #hawaiivacation #oahutours #hawaii #hawaiistagram #sealife #oceanlife #marinefacts #dolphintours #unrealhawaii」7月3日 9時19分