After the October 2019 quiz photo, this one seems a lot more straightforward. A bird clinging to the side of a tree, right side up. Yes, there are bird species that regularly or habitually cling to the trunks of trees that aren’t woodpeckers, but the Picidae is a good place to start when one encounters such. However, it’s also good to endeavor to rule out other such birds quickly. Most other regular tree-clinging birds can be ruled out by our quiz bird’s underparts pattern, particularly the ill-defined wavy dark bars on the side. Thus, we can throw out the Sittidae (nuthatches), Certhiidae (creepers), and Yellow-throated and Pine Warblers.