Fermibiyss
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Jaydohves living on Fermi island found themselves splitting and evolving into the fermibiyss. The fermibiyss has practically seized the polar marine regions of southern Sagan 4. In order for this to have happened, the fermibiyss went through insular gigantism, allowing it to become considerably larger than its ancestor and allowing it to feed on prey animals of all sorts, such prey animals typically consist of various gilltails and gillfins, larger anipedes, squids, and shellears. On top of these typical prey, the fermibiyss is capable of hunting and eating some predators that live in its regions such as seaswimmers, some scylarians, and even the occasional baby slaesosaurus. Lastly, proving that the fermibiyss is hardly a finicky eater, it will sometimes feast on wounded prey that it would normally never find with its usual routines of fishing such as leafshells, skysnappers, and even phlyers that get stranded in the water.
To further help with its fishing lifestyle, the fermibiyss has evolved countershading with its top being black and its underbelly being white, providing some form of camouflage while it swimming in the ocean. Along with that, the black on the fermibiyss helps it absorb heat from the sun and helps keep it warm in the icy polar waters. On top of that, the fermibiyss has a thick layer of blubber that gives it further protection against the cold.
Much like its ancestor, the fermibiyss is an example of convergent evolution. In this case, the fermibiyss has petrolignin in its body, similarly to its relative, the shorelance; however, unlike the shorelance, the fermibiyss' beak, teeth, skull, backbone, and claws are composed of petrolignin, providing more weight to its body and allowing it to dive deeper than its ancestor could. To further help with its deep-sea hunts, the fermibiyss has evolved a second butt-nostril to help it take in more air and even continue breathing air while its other butt-nostril is submerged. Another adaptation that the fermibiyss has to help it deal with low oxygen levels is that its spleen has not only considerably enlarged, but also has become highly vascularized, repurposing it to be especially good at absorbing and storing oxygen. On top of that, the fermibiyss is able to slow down its own heart rate to further reduce oxygen consumption while it is in the Twilight Zone. Lastly, the fermibiyss has the ability to switch between aerobic and anaerobic respiration; more specifically, it can provide its muscles with enough oxygen to boost it or switch to keeping the oxygen going in its heart and brain, this is similar to how Terran penguins manage to survive deep-sea dives. These means of respiration allow the fermibiyss to further conserve oxygen during its dives.
The fermibiyss is still migratory and still highly aggressive like its ancestral jaydohves. Fermibiysses will charge, bite, peck, headbutt, body-slam, and vomit on any invaders coming into their territory. Fermibiysses live in large groups called ‘gluts' that consist of 2 males and 10-18 females. The males will defend their mates from other rivals by fighting until either one yields or dies. Should rival males win, they will kill the previous males' offspring in order to mate with the females and produce its own. For their fishing routines, one male and his set of females will forage for food to feed not only themselves, but also their offspring and the offspring of the other male and remaining females; then it switches to the other male and its females doing the foraging and so forth. For migration, the fermibiyss spends a large portion of its life in the open ocean until breeding season, wherein they gather around the polar beaches and the South Sagan 4 Ice Sheet to raise their young. The fermibiyss typically has 1-2 offspring at a time that the mother protects from the cold by huddling close or by getting the father to help carefully lift their young to lie on the mother's back.