Cranes, Plains, and Autofocus

Each fall, sandhill cranes move through the agriculturally dominated plains of North America in flocks of thousands, taunting the autofocus of all Canon DSL cameras on the continent. The following excerpt comes from National Geographic:

"At four feet tall, sandhill cranes are some of the biggest flying birds. (The endangered whooping crane can grow to five feet tall, and ostriches and emus are taller but earthbound.) Sandhills have heavy bodies layered with gray feathers that form a “bustle” over their back ends. They also have lanky legs, and long, curving necks that lead to heads topped with crowns of crimson feathers.