Salmon returning from the sea to freshwater rivers to spawn is a good example of a migration to a special habitat. A final example of special habitat migration occurs with leopard frogs, who move to ponds to reproduce and, after breeding, return to terrestrial habitats where they establish home ranges. The habitat currently being inhabited must be sufficiently lacking in providing these needs, so the risk and energy cost of movement is overshadowed. This characteristic applies both to human and non-human animals. Human history, both ancient and current, has many examples of human migrations based on our four basic biological needs.
Migration is a wonderful interdisciplinary topic to tackle in the classroom.
Many Internet projects deal with following animal migrations. Project Aquatic WILD, and One Bird Two Habitats. The Biology of Life on the Move. Oxford University Press. New York, 1996.