Migration is not bound to a particular definition. We try to categorize particular movements as migration but it is not always possible. Animals change their habitats and shift their base from one place to another for different reasons. Like humans, animals also try to find the best facilities for themselves and their offspring. Generally when animals go from one place to another for some reason at a certain season, it is termed as migration. Animals and birds tend to follow a familiar route and always go to the same place for the same purpose. They are bound to the habits of migration but sometimes it is difficult to determine if their movements can be categorized under migration or not.
