Saturday, June 12, 2010
The scientific hypothesis is that these flickers were isolated about the time of the last glaciation, about 10,000 years ago. When the populations were separate, they differentiated. As the populations came back into contact after the glacier receded, they had not changed enough to prohibit them from massively interbreeding.
The top photo is of a bird recently banded near Northfield, Minnesota; the middle on is at a feeder in Aberdeen, South Dakota; the red-shafted flicker is on a cottonwood in Missoula, Montana.
Posted by Dan Tallman at 10:36 AM