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Great white sharks (鲨鱼) in the Pacific Ocean. Wildebeest (角马) in Africa. Arctic terns (北极燕鸥) in the
Atlantic. At first, these animals seem quite different. One swims, one walks,
and the other flies. But they all have one thing in common. They all migrate (迁徙).
Some migrating animals
move to a place with better temperatures. Some go to find food or water. The
groups travel as one, but during the trip, they face many different challenges.
One challenge is
distance (距离). Some migrating animals
take very long trips. For example, one great white shark swam from Australia to
South Africa and back. In nine months, it swam about 20, 000 kilometers!
Another challenge is finding enough food or
water during the journey. For example, each Mali elephant needs over 200 liters
(升) of water each day. To get this, they need to
go from one waterhole to another.
Besides, migrating
animals have to keep away from other animals because they want to eat them. The
zebra (斑马) has to avoid lions. Traveling as a group
helps keep them safe. When one zebra is in trouble, the other members make a
circle around it.
By working as a group,
migrating animals travel to live better lives.
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