Each year the Platte River in south-central Nebraska hosts an incredible migration of Sandhill Cranes. The cranes start to arrive in early to mid-February and the numbers generally peak in mid-March. An estimated 90% of the world's Sandhill Cranes, some half-million, spend a few weeks along a 50 mile stretch of river in preparation for their journey north to summer habitats in Canada, Alaska and Siberia.