Sandhill Cranes Spotted Migrating North on 2-15-2013 in Woodstock, GA

Here are some other dates that I've seen sandhill cranes over our home in Woodstock, GA:

Sandhill Cranes Migrating South on 11-25-2012

Sandhill Cranes Migrating South, 1/1/2012

Sandhill Cranes Migrating North on 2-18-2011

Sandhill Cranes Migrating North Mar 4, 2008

Sandhill Cranes Migrating South Nov 30, 2008

Sandhill Cranes Migrating North Mar 3, 2007

Sandhill Cranes Migrating North Feb 21, 2006

Sandhill Cranes Migrating South Dec 13, 2005

Sandhill Cranes Migrating North Feb 22, 2005

Sandhill Cranes Migrating South Nov 27, 2004

Can they predict the beginning and end of Winter?