Hairy and Downy Woodpeckers are very similar in appearance except the Hairy is larger and its beak is longer. When they’re side by side, it’s easy to tell them apart. But when they are alone on a tree and hammering into a tree trunk with their beak buried in wood, it can be difficult to tell the difference. This Hairy extracted its beak from the trunk when I took this shot so it is easy to see that its beak is long. Taken at Sax-Zim Bog in Minnesota.