Krayt serpent

The krayt serpents are a species of highly venomous elapid snake native to the oceans and seas of Chaoterra. It is one of the earliest creatures introduced to the planet.

Biology
The krayt serpent was very bizzare in shape compared to other snakes, having a long skull and a shorter body than other snakes, with its most prominent feature being its hind limbs, which was evolved to swim faster in contrast to its short body. Although they were predators these creatures were very agile in order to avoid predation from the Golden bellied sea serpents which were far more larger than it and was the top predator of Chaoterra's oceans. Although their ancestors can slither up on land, the krayt serpents have evolved to be far more at home underwater, in fact, they took this aquatic life to an even greater extreme. Despite having no external ear, they have fully formed inner ear structures connected directly with their jaw bone, they listen to their prey by putting their jaws to any surface and detecting nearby vibrations from their prey. Also known as the zebra snake, this snake is known for its black and white coloring and the ability to swim as fast as a horse running.

Behaviour
Krayt serpents were nocturnal reptiles, meaning that they often hunt at night. Though they possess highly toxic venom, these snakes are usually very shy and were outcompeted by other sea creatures during the Proterocene. They hunt small fish and will chase down larger prey if they were in numbers. Krayt serpents were capable of diving up to 100 meters deep in a single hunt. Using their two hind limbs the krayt serpents could climb up steep edges underwater, and is also useful for short explosive bursts of speed while chasing down its prey.

Extinction
The extinction of the krayt serpent was highly debated by scientists, with some hypothesizing that its extinction is caused by climate change while others think of competition or a lack of food sources.

Evolution
Krayt serpents evolved from sea kraits who were introduced to Chaoterra when there was only oceans. As continents are very rare, krayt serpents became fully aquatic, and evolved a pair of limbs to help them swim. The krayt serpents, despite being small and easily outcompeted, were an evolutionary giant in the fauna of Chaoterra, as scientists who came to this planet were baffled by what they saw. Due to being the first ever snakes with limbs (apart from the ancient snakes), they were able to crawl on land eventually and evolve into the most dominant creatures on Chaoterra, the magnasaurs.