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Seven dolphins live at the National Aquarium(水族馆). They their whole lives in captivity(囚禁）for five years. But soon，the dolphins to a protected space.
It is more like a dolphin's natural habitat(居住地).
Some scientists now believe dolphins can't healthy and happy in aquariums. New research shows that wild dolphins are very active. They are really good at . In the ocean，they dive down hundreds of feet. They travel up to 100 miles a day. Captive dolphins cannot do these things.
Some animals born in captivity can be placed in the wild. But dolphins usually cannot. A dolphin's mother her baby to hunt and stay safe. Humans can't teach those lessons. The dolphins will have more freedom. But they will still be protected.
The aquarium to find a proper place now but still hasn't decided where they will live. But it will be connected to the ocean. And it will have plants and other animals. The dolphins will have lots of room to swim. But trainers will still take care of them. Visitors might be able to them from far away.
Dolphins make two types of sounds: whistles(鸣叫) and clicks(咔哒声). They use whistles with one another. Each dolphin's whistle is unique. Their clicks create vibrations(振动). The vibrations travel through the water. They bounce off(弹回)objects like plants and animals. Then the vibrations to the dolphin. This is how dolphins use sound to" see." It echolocation(回声定位). Some trips and diving machines are also using echolocation.
