A BRIEF HISTORY OF CRANE MIGRATION
Migrations for many animal species on land, in water, and in the air are quite remarkable. For Sandhill Cranes, they have the anatomical abilities with six foot wing spans, hollow bones, long legs, and light, streamlined bodies to fly long distances and to have the built- in migration 'software' inside their brains. These evolutionary tools have been refined and changed over many generations to insure the survival of the species. It is an ongoing process, for if a species can stay put in one place and survive, it is advantageous to do so. How did the process actually begin? The driving forces for migration are the same as are the needs for humans, food, water, shelter, clothing and an environment in which to raise a family.