No, its head really isn’t dirty. This particular eagle is in fact just young, probably around four years old. Bald Eagles are born entirely brown and then gradually change in the years to come, not getting their distinctive white head and dark brown plumage until they are about five.
I captured this image back in March in Morgan County, Colorado as the eagles were preparing to leave for the summer. We are now at the opposite end of their annual movement and should start seeing them arrive here soon along the Front Range for winter. I can’t wait! If you live in the area and happen to spot any, please do let me know. Have a great weekend!