ナショナルジオグラフィックさんのインスタグラム写真 - (ナショナルジオグラフィックInstagram)「Photo by @bertiegregory | A giant moray eel on a coral reef at night in the northern Red Sea, Egypt. Despite their intimidating looks and their size (they can grow up to 10 feet/3 meters in length), these eels are rarely aggressive toward divers. Their mouth is a marker of their mood. Surprisingly, if they are opening and closing their mouth and baring their teeth, they are relaxed and it's safe to approach. If their mouth is closed, keep your distance! //To get an up-close look at animals that survive our planet's most extreme environments, watch #HostilePlanet on @natgeochannel tonight at 9/8c.//」4月1日 21時02分