After watching the darwin 4 documentary over the weekend I decided skewers were cool and decided to add a variant of them to my story.

So, canonically, the entirety of Silen (the continent Lindsen is located on) was created by Komi(me), and humans were later introduced. Thus, the animals that live there have quite different anatomies from what we're used to. These include the massive flying organisms known as 1/1/17/4. Now this family is quite diverse, and actually consists of two major lineages, 1/1/17/4/1 and its derivatives, as well as 1/1/17/4/2.

1/1/17/4/1 is the older of the two. Organisms of this group have two large jet pods on their backs, while their bodies are torpedo-shaped, with a large mouth that can expand to swallow prey. Teeth are present inside the throat, to aid in crushing it. Juices are digested in the stomach. Most waste is immediately expelled to reduce weight, while nutrients enter the blood. Several large blood vessels flow past the jet pods to cool off, also heating the air inside slightly.

In two organs beneath the jet pods, glucose and fat are metabolized into methane. Upon entering the jet pods, air first goes through several tightly compacted swirls to increase pressure, then into a combustion chamber which expanding muscles can compress. Methane is added here, and electrical pulses from ignition nerves ignite the mixture. A sphincter opens shortly following a compression to allow the heated air to release.

Most members of the 1/1/17/4/1 family have not lost their hind fins. They have instead evolved into two triangular fins that sit directly behind the jet pods, possible directing the flow of air. A single large tail that resembles a boat's rudder is located at the end of the organism and has colorful patterns that may aid it in finding mates. The two wings resemble elongated triangles. The eyes sit close to the lower jaw, and transparent eyelids can cover them when prey is being attacked.

While superficially similar, 1/1/17/4/2 is quite a different family. For one, its jet pods are located at the base of the wings. It lacks stabilizers, as its fins have migrated to where its lower jaw once was to form a sharp, flexible organ resembling a limb crossed with a jaw that can impale prey. It is smaller and faster than its cousins in 1/1/17/4/1, as its smaller size (though it's still very big, it has a wingspan of 6 meters and a length of roughly 3) ensures it can have a faster metabolism.

These two species have been regarded as pests due to their hunting of herds of livestock. In the past, little could be done about them due to the lacking of any weapons that would be effective against their speed. However, developments in firearms have caused a considerable decline in their numbers. If the living jets are to remain in Silen's skies, action must be taken to protect them.

Although, frankly, given all the shit that's going on in Silen, I wouldn't blame them if preserving these species are pretty low on their list of priorities.