字幕表 動画を再生する 英語字幕をプリント This episode of "Discovery Wild Safari" is brought to you by Little Debbie. Welcome to "Discovery World Safari." On today's episode, the hippopotamus. Hippos once had a broader distribution, but now live in eastern, central, and southern sub-Saharan Africa, where the populations are in decline. Hippos are the third-largest land mammal species on Earth, after elephants and white rhinos. They weigh about 7,900 pounds and are 15 feet long. They spend 16 hours a day in water, which is why the Greeks them the "river horse." Hippos are graceful in water and can hold their breath for up to five minutes. Their eyes and nostrils are located high on their heads, which allows them to see and breathe while mostly submerged. Hippos secrete an oily, red substance that is a skin moistener, bug repellent, and sunblock. Their hide alone weighs half a ton. At sunset, hippos leave the water and graze on land. They may eat some 80 pounds of grass in one evening, which proportionately isn't that much food. They may run back to the water as fast as 13 miles per hour if they feel threatened. Please subscribe to the channel and share this episode with your friends. Tell us in the comment section below what animal you'd like to see on "Discovery Wild Safari." New episodes every Monday.