The longfeather has the largest wingspan of any flying creature on Una, at a length of just over 7 meters (23 ft). This bird can produce as much as 250 kg (550 lbs) of lift greater than its own mass. It is used for travel, mercantile, and manual labor. The longfeather is native to the Emades Aerolithion mountain range of the Argentian territories and can be found both wild and domesticated.
It uses its large taloned feet to grasp onto potential prey, comprised of smaller flight birds. The longfeather has adapted for high-speed flight. It is capable of gliding and diving at an airspeed faster than any ship is currently capable. Those who need to reach a location quickly will opt for using the longfeather over other means of transportation.
They can fly or glide nearly indefinitely; as long as multiple weeks, without stopping to land. The longfeather can rest each hemisphere of its brain independently and can keep an eye out for prey birds at night. When it needs to take a complete rest, it can beat to a high altitude and make a long descending glide. Reawakening, alerted by a change in air pressure.
Longfeathers have a famously pale-blue color, used to hide from their prey at high altitudes. The bird gets its name from its incredibly long feathers. The flight feathers can be as long as 90 centimeters (3 ft), and its tail feathers are an astonishing 210 centimeters (7 ft) in length. The second longest of any known bird in Una. While in long-distance flight, a longfeather flays its body out to become a sheet of wing-like shapes 7 meters (23 ft) in width. The flag of Lusteria is a highly stylized longfeather as viewed from above.