Answer:
There are several reasons why some animals migrate while others are able to live in the same place year-round. One of the main reasons is related to the availability of resources such as food, water, and shelter. Animals that live in areas with a stable and predictable supply of resources may not need to migrate, while those that live in areas with seasonal changes in resource availability may need to move to find food and water.
Another factor that can influence migration is climate. Animals that are adapted to cold temperatures may migrate to warmer areas during the winter months, while those that are adapted to warmer temperatures may migrate to cooler areas during the summer months.
Genetics and evolution can also play a role in migration patterns. Some species have evolved to migrate as a way to avoid predators or to take advantage of seasonal changes in resource availability. Other species have evolved to stay in one place year-round and have developed adaptations that allow them to survive in their environment without the need to migrate.
Overall, the decision to migrate or stay in one place year-round is influenced by a complex interplay of environmental, genetic, and evolutionary factors.