Welcome to the hummingbird master class on nest concealment and feeding basics. These 2-inch-wide rufous hummingbird nests are built with moss, or other soft plant material, held together with spider web and camouflaged with lichen. And the lucky chicks, likely two, get a regurgitated feeding of nectar with a side of insects mom caught in midair. This amazing scene was captured recently at Billy Frank Jr. Nisqually National Wildlife Refuge in western Washington state. USFWS video: A. Froschauer