Every fall, the skies fill with travelers on journeys that seem to be the work of a fantasy writer— birds crossing oceans, continents, even hemispheres. Calling these migrations miracles of endurance is not an exaggeration, but given their physiological traits, you can see how these miracles happen. But these miracles end against glass. Here are five of the most remarkable long-distance migrants on the move right now — and why they need our protection: ⁃ Arctic Tern – Flies from pole to pole, up to 70,000 km every year — the longest migration of any animal. Source: British Antarctic Survey ⁃ Blackpoll Warbler – Weighs less than an ounce, but flies 3,000 km nonstop over the Atlantic. Source: Cornell Lab of Ornithology ⁃ Swainson’s Hawk – Travels from Canada to Argentina, more than 10,000 km. Source: USGS ⁃ Ruby-throated Hummingbird – Just 3 grams, crossing the Gulf of Mexico in one flight. Source: Smithsonian Migratory Bird Center ⁃ Bobolink – A cheerful grassland bird making a 20,0...