This is a species of large crane in North America. Their large wingspans, typically 6-8 feet, make them very skilled soaring birds, similar in style to hawks and eagles. Using thermals to obtain lift, they can stay aloft for many hours, requiring only occasional flapping of their wings, thus expending little energy. Migratory flocks contain hundreds of birds, and can create clear outlines of the normally invisible rising columns of air (thermals) they ride. Wikipedia
This is a family here in WI with their newborn.