This is Science Photo of the Day #100! What is special about the way that Great Blue Herons clean their feathers?
Correct, as usual. Great Blue Herons have special feathers called Powder Down on some areas of their body. When they scratch those areas, the ends of the feathers break off into a fine powder, which absorbs oils and dirt from their feathers. Then they use a specially adapted claw to comb the feathers, removing the powder and the dirt.