Some migrating groups move to a place with a better temperature. Some go to find food or water. The groups travel as one, trying to survive. During the trip, they face many different challenges. One challenge is distance. 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 Mali elephant needs over 200 liters of water each day. To get this, they need to go from one waterhole to another.