Sea Dragons (Aquadraco Marewurm) are large aquatic Squamates native to the North Sea but have been spotted in the Atlantic Ocean, as well as the Irish and Celtic sea.

Origin/evolutionary history: Like all dragons, they've really begun to diverge and become big in the Eocene Epoch, their ancestor's currently unknown, but they most likely split off from a common ancestor from drakes and lindwurms as a means of avoiding competition with other dragons and big threats like royal wyverns and most likely became fully aquatic around a couple of million years after the Eocene.

Physiology/biology: Sea Dragons, like lindwurms on land, mostly move around their environment via their limbs, rather than in a fully serpentine slither. Their horns have been greatly reduced to avoid drag in the waters, and they've also lost the ability to spit venom, but still can deliver a venomous bite, which combined with how they, like mosasaurs, have a second row of teeth, can deliver dose after dose into whatever poor creature's trapped in their jaws. Sea Dragons prey upon a variety of medium to fish, other sea dragons should they be weak and/or small enough, humans, seals, sea lions, young and/or small sharks, any medium-sized prey item on land should it come near or in the water, and even orcas, should they be alone, and young, old, sick, or wounded. They're dark blue with light blue stripes and a dull light grey underside, they also have fully black eyes. Due to the placement of the nostrils remaining the same, they swim and hunt near the surface. They also compensate their inability to spit venom by being able to do the next best thing in terms of long ranged attacks and thus be able to prey upon creatures in the air or on land but close to the water's edge, via spitting a jet of high-pressured water at their target, while it's certainly incapable of doing it to the extent of cutting through tough material like metal like butter, it can easily and quickly stun or outright kill the target. They can grow from 23-26 ft long, and swim around 37 mph tops, and 16-19 mph for casual speed. Despite their size and much like with another great predator that could rival them, orcas, sea dragons are known to risk beaching themselves in pursuit of prey, and to a notably higher success rate than most orcas, as they're smaller and have a longer reach. As they're marine creatures and are too large to crawl onto land, they give birth to live young close to the surface, gestation period's not well-known, but their mating season starts after the beginning of summer near midsummer.

Behavior: Sea Dragons are less territorial than their land-based cousins, as they're much more nomadic and explorative. Their intellect is unknown, they seem to be more primitive like basal lindwurms and drakes, but have been reported to possess higher intellect similar to regular dragons, some possible evidence for this is shown with vibrant and spectacular arrangements of shiny objects decorated on the muddy and sandy bottoms near or within the shallow waters were found, strongly suggesting complex courtship rituals during mating season. More tests like the mirror test are needed to be conducted for further analysis on their intelligence. While being fierce nigh-apex predators, they are afraid of great whites should they get the jump on them, or orcas, and will certainly try to flee should they come across a pod of them, but there's an animal that alone is the main reason why they're not the true apex of their northern sea homes, jormungandrs, the giant apex predators of the region, even looking down at the darker waters below is frightful enough to send them swimming away fast should they spot a murky serpentine silhouette, even if it's just another sea dragon or an eel.

Weaknesses/termination methods; As stated previously, great whites and orcas can rival them, and a jormungandr can easily prey upon them. Piercing weapons and explosives are effective like with other dragons and are hardly hindered in the water, electrical shocks are another very effective means due to their aquatic environment. As they lack gills they need to go to the surface to breathe, or they'll drown, when surfaced they can be taken out with a high powered rifle or shotgun with one or two shots.

Containment/handling procedures: Like all dragons, they don't do well in captivity, even if containment was somehow managed, even more so than with most dragons as they need to move around a lot in vast open spaces. Only a few reports and even fewer real reliable accounts have been made where sea dragons have been trained by those they imprinted on as hatchlings, and like the sea dragons themselves are nomadic and adventurous. Art by https://www.deviantart.com/sheather888