This is a plains scrack. Scracks are one of the more common creatures amongst the Treoxx conglomerate race. Scracks are highly adaptable as well as extremely hardy in many conditions. Their smooth and slippery skin is very thick and elastic with an oily sheen to it making them resistant to many low-powered projectile weapons. Many societies use scrack skin to make clothing, upholstery, and camping gear out of since it can be stretched tightly yet still snap back and it is also waterproof.

Scracks are almost universally despised by non-Treoxx because of their dietary and behavioral habits. They are considered to represent the worst of what the Treoxx can be. A scrack is a carnivore, but it will eat anything edible that it catches or finds. Scracks are especially fond of carrion, and even cannibalism is not out of the question, as they will even eat the remains of other scracks with no hesitation. Although quite powerful, scracks are generally considered to be quite cowardly, as they will not hesitate to flee from anything that threatens to put up a good fight. However, they are well known for their skill at gaining the upper hand if forced into an all out fight as they are notoriously adept at employing tactics that many people consider the very definition of "underhanded". The scrack played a large part in contributing to the negative image of the Treoxx to those that know about them.

The scrack is one of the few species that make up the Treoxx amalgamation that could be said to be fully sapient. Scracks are seen fulfilling a variety of roles and tasks because of their versatility and high intelligence. In the wild, they were in a pre-civilization state as they were generally solitary but gathered together in large groups in areas with an abundance of food. Within a few thousand more years, they might have developed a language and civilization on their own. Their version of the Treoxx language that they use for intertreoxx communication consists of high-pitched screeching and shrill squawking noises.

There are several intriguing features about the scrack, the first one being its ability to produce trichloroethylene vapor when cornered or threatened. There is a cord of skin and connective tissue that is attached to the back of their heads and is connected with the base of the neck. There is a pair of openings that release trichloroethylene in a spray of fine mist that is a deadly poison to most creatures when inhaled. During the release of the trichloroethylene, the scrack will clench its nostrils shut in order to avoid inhaling its own poison. Trichloroethylene acts as a depressant on the central nervous system, leading to symptoms similar to alcohol intoxication such as dizziness, confusion, motor impairment, nausea, and finally, death. This is why the skin coloration of most species of scracks is vivid in eye-catching patterns as an example of aposomatic coloration, as scracks lack eyes.

Another interesting evolutionary adaptation of the scrack is that of thermosensory navigation. A scrack cannot sense optical stimuli, but it can sense the layout of the environment around it as it has a pair of specialized nerves that branch off into the skin over its forehead and connect to the brain through foramens in the skull. These nerve clusters on each side of the scrack's head form a three dimensional image of its surroundings much like an infrared camera. The hotter an object is, the "brighter" it is to a scrack, and it can perceive different wavelengths of heat as "color" although the "colors" that a scrack perceives are probably an entirely different range than that of the human eye. As a scrack's thermoneurological receptors are very sensitive, they can easily make out surface details in objects from micro-variations in temperature around surface landmarks. The world that a scrack "sees" is probably very much like that of our own, except the colors would be totally alien to our perception. A scrack can also "dim" or stop its thermoneurological receptors from firing signals to its brain, as really hot objects appear too "bright" for them to look at, just like how it hurts our eyes to stare at the intensity of the sun's light.

Finally, a scrack has the physiological ability to slowly recover from most injuries that it sustains that are not immediately fatal. This includes regenerating lost limbs and organs if it does not die from the shock, blood loss, infection, or incapacitation of the initial injury itself. Even in the wild, the normal lifespan of a scrack would be around seventy of our years as they have few natural predators due to their poisonous nature.

Biologically speaking, scracks belong in their own taxonomic order, although they have traits that are reminiscent of both mammals and amphibians. Their skin lacks hair or scales, and they do not have mammary glands, but they can sweat. The heart of a scrack is four chambered, but the walls between all four chambers are completely enclosed. Scracks reproduce by laying eggs, and fertilization takes place externally before the exteriors of the fibrous eggs harden. As soon as they eggs are laid, the female leaves and abandons the nest, while the male assumes “egg guarding” behavior until the eggs hatch and then the male leaves the young to fend for themselves.

The scrack has been highly successful in an evolutionary sense on its home world as they are found on every continent and in almost every biome. Most of their planet consists of tropical and desert climates. Because of this, scracks have a network of capillaries in the upper layer of their skin that allow them to lose heat by vasodilation. This also prevents them from living in temperate climates as this makes them extremely sensitive to hypothermia.

When scracks hatch, they lack arms and legs and resemble worms. As they mature, limb buds develop and gradually turn into their upper and lower limbs, much like how a tadpole turns into a frog. In scracks, the upper limbs typically mature first. Typically, there are some sexually dimorphic traits between male and female scracks. Although male and female scracks are of the same height and in some cases the males are shorter, male scracks usually weigh more than their female counterparts.

There are eighteen species of scrack. The plains scrack is native to the tropical savanna near the western region of the continent of Syrogia on its native planet. The plains scrack has a height of 1.2-1.5 (male and female) meters, and a weight of 125-136 kilograms (male) or 100-122 kilograms (female). The coloration of the plains scrack is typically black with orange, yellow, and red splotches.
The plains scrack mates during the end of the winter storms that typically pass through Syrogia’s grasslands every year. The female begins courtship by choosing a suitable male. Suitability in scracks is based on the ability of males to bring the female a “gift” in the form of food. If the male is accepted, male proceeds to mount the female’s back and fertilize her eggs by extending his backwards oriented genital prominence from his cloacal cavity and spraying them with semen as they are released from the female’s cloaca. Embryonic development in the plains scrack usually lasts for one to two Terran months, with physical maturity in ten Terran years.