ICYMI: The U.S. Fish & Wildlife Service spotted this hummingbird building a 2-inch-wide rufous nest at Billy Frank Jr. Nisqually National Wildlife Refuge in western Washington state. The nest uses moss (or other soft plant material), and is held together with spider web and camouflaged with lichen, per USFWS, who called it a "hummingbird master class on nest concealment and feeding basics." According to Audubon, "studies point out some new potential challenges to migrating hummingbirds, such as