Tetrapterates are four-winged flyers of hexapodal ancestry. In local Furahan parlance they are often referred to as 'avians'. In evolution, the first two pairs of legs were transformed into wings, leaving just the hind pair as functional legs. Flying with four wings is of course not unique to Furaha, as insects on Earth have four wings too. However, there are no larger animals on Earth with four wings, but there are on Furaha
The bulchouk shown here shows a typical tetrapterate body shape. In most species the front wings serve as 'canard' wings, augmenting the lift of the major wings. A similar arrangements can be found on sailing ships, where the jib sail works in similar fashion.

The flyg is also shown on the 'air' page. It provides another example of the overlapping wings pattern, and is as such a nice example of the group known as 'short avians', referring to the close spacing of the wings.

The seasoar also has a page devoted to it; the reason to show it again here is that it illustrates the body scheme of the so-called 'long avians', in whom the distance between the roots of the first and second wing pairs are much elongated. In many ways this is an odd arrangement, as the result is not inherently stable. In fact, only continuous minute movements of the wings allow the seasoar and other long avians to control their flight -which they excel at!-.