Long distance migration

Among the many animals that perform long distance migration, such as butterflies, fish, marine-turtles and marine mammals, birds represent the most impressive performers. They are also the best-studied group, with many more details known of their migratory accomplishments and the factors involved in their orientation, than in other groups. The main question of how birds actually do navigate, however, remains unanswered. In this article Professor Schmidt-Koenig reviews the available evidence and suggests that a multiplicity of cues and strategies may be involved.