Some migrating animals take very long trips.
They go far away from their home areas.
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 and water during the journey.
For example , each Mail elephant needs over 200 liters of water each day.
To addition , migrating animals have to avoid other animals that want to eat them.
For example , the zebra has to stay away from lions.
Traveling as a group helps keep them safe.
All the zebras in the group can watch for danger.
When one zebra is in trouble , the other members make a circle around it.
By working as a group , migrating animals can survive some of the world's most extraordinary journeys.