New Species discovered on Pandora
The banshee has a complex cooling system to keep it from overheating during strenuous flying. The breathing system is central to this cooling. The air inlets, or spiracles, face forward at the front of the chest cavity. The banshee lung is a bellows like structure, inflated by rib movement, but unlike the lungs of terrestrial animals, it has unidirectional flow, venting aft through gill-like slits.
They only have vestigial legs
prey will be smaller airborne creatures or possibly creatures perched high in the trees as they could not grab on to something while in flight, as seen in Earth eagles.
The wings of a banshee are shaped like a mixture of Terran bird and bat wings. The arm ends with four "fingers" with membranes and a thumb forming a claw like a bat. The first three fingers, however, are separate from the main membrane and from the fore-wings. Each large fore-wing has three primary vanes at its tip. These form like the wings of a dragonfly, by the extrusion of a resin into the veins of a flexible membrane, which unfurls, then cures in the sun into a rigid transparent vane. These vanes are replaced through molting. The vanes function similarly to the feather structures of Terran birds. They are designed to let air pass between them easily for upstrokes and partially overlap to block the air and provide a greater upstroke for downstrokes. The partially overlapping wing design possibly serves to increase the buoyancy in still flight
The Grace Augustine first discovered the Banshee when in the forests of pandora searching for new creatures