Do you know what are the World’s tallest animals? How do they sleep and drink?
You may think it's difficult for them to sleep, but they have no such problems because giraffes don’t often stop for a snooze(打盹). As they are so tall—males can grow up to 18 feet, giraffes actually have the shortest sleep requirement of all mamma1s哺乳动物), with an average(平均) of half an hour a day. When they sleep, they seldom lie down and sleep for minutes at a time, since it's difficult for them to get up again and it’s dangerous in the wild. But the giraffe in the zoo sleeps around 4.6 hours per day, mostly at night. It usually sleeps lying down.
Drinking Water may cause problems for the animals because their long necks are too short to reach the ground. To drink they must spread their legs in an uncomfortable position, which makes them easily hunted by other animals like Africa's big cats. As a result. thev get most of their water from the plants that they eat. They only need to drink water every few days.

How1ong do giraffes living in the wild sleep every day?
How does the giraffe in the zoo usua11y sleep?
What must giraffes do to drink water?
What's the main idea of the passage?
请将划线句子翻译成汉语,,