Rajang Ecology

Disclaimer: This is merely a plausible explanation for the monster(s) in this article, and should not be considered canon.

In-Game Information
"Ultra-Aggressive creature that is rarely sighted and seldom survived. Survivors report it exhibits a strange attack. The Rajang is said to be a loner, and this isolated life has made it difficult to pin down its territorial leanings."

Taxonomy
Easily the largest and strongest of known Pelagus; Rajang resembles a Blangonga but with a much darker coloration, two long horns and a more muscular apearence. Unlike other Pelagus species, Rajang is the only one to exhibit the ability to generate large amounts of electricity. The only known creature with a stronger electrical output is the legendary White Fatalis. But this is besides the point.

Habitat Range
Due to the Rajang's near-permanent nomadic lifestyle, it's not entirely certain where the Rajang is capable of living (though it's not farfetched to assume that it can live just about anywhere). However, there have been regular sightings in high-altitude areas, for the most part, so it's safe to say that "If there's cliffs, there's Rajangs". This common phrase is a direct result of its two most common habitats: Mountainous regions (volcanic or frozen; the Rajang apparently doesn't care) and canyon regions. The Rajang can also be called a "wanderer", like the Deviljho.

Ecological Niche
In almost any habitat that the Rajang happens to be passing through, it enforces itself as the apex predator of the surrounding area. Its nature and adaptations allow it to hunt and prey on virtually anything smaller than itself, and anything larger (such as a Tigrex, which also inhabits similar environments) tends to avoid it due to its absurdly aggressive behavior.

On an interesting note, The Rajang is believed to be the sole predator of the elusive Kirin.

The reproductive patterns of Rajang are, at best, elusive. Not many hunters have had the good fortune to personally observe how Rajang care for their young, whether the parent creature guards the nest like the infamous Rathian/Rathalos pair, or immediately leave the offspring to fend for themselves after conception to continue their nomadic lifestyle. Such information is very much prized by the Guild, were it not for the fact that Rajang are so agressive towards hunters. Hunting Rajang in force would now seem a more sensible choice after hunters are faced with such a task.

Biological Adaptations
Rajang is one of only a handful of monsters able to wield deadly lightning. How it produces its charge is unknown, but most likely tied to static electricity created by the beast's fur, or an electrical inner organ. Rajang are extremely fast and nimble despite their size. Rajang appear to have very poor eyesight, relying mostly on smell to accurately find prey. Rajang exhibits extreme physical strength, easily knocking a hunter off his feet and into the air. Rajang's natural high aggression and rage only seem to amplify its strength and electrical power, forcing it into a "Golden Rajang" (nicknamed "Super Saiyan") state. When golden, Rajang is even faster and more deadly than its already powerful base form. In this "form", it is probably able to be on par or even overpower elder dragons like Teostra and Lunastra, which are known to be very powerful, which is why no elder dragon will approach it's territory in the volcano or the snowy mountains.

Behavior
Outwardly, the Rajang is considered to be the most aggressive of Pelagus species known thus far, and as such, many consider this to be an outright brutal creature in all its aspects. This however, is surprisingly untrue.

It's a common belief that the Rajang is a loner due to being highly territorial, and this thinking leads people to believe that Rajangs will typically attack each other on sight. In a sense, that's correct. Rajang are unique in that they're the only known species in their genera to live a majorly solitary lifestyle (as opposed to the far more sociable Congas and Blangos), and can go months, even years on occasion, without ever making contact with another of its kind. However, in the chance that two meet, something completely fascinating occurs.

Upon making eye contact with each other, the two Rajang immediately enter a state of apparent rage, golden hairs standing on end. The two lunge at each other and fight and punch each othere until one gives up or is dead

Assuming the two are of opposite genders, they will also mate during this time period, and after a gestation period of roughly 6 months, the female will give birth to one or rarely two offspring. An interesting thing to note is that the offspring will have a fur color that is predominately the same color of the surrounding environment. It is unknown how this is determined genetically, but regardless, the effectiveness of it is apparent. During the two-year time period that the young stay with the mother, the mother stays in a near-constant state of rage (or at least, it appears as such). This is also accompanied by a surge of adrenaline, resulting in strength and tenacity far beyond the creature's already unsurpassed abilities.

As one should already be well-aware of, the Rajang is infamous for its aggressiveness (aside from the points above). This is attributed to what some believe to be the beast's poor eyesight (which is understandable: they even attack each other initially, perhaps as a result of not recognizing each other). Against most prey, the Rajang will quickly and effectively pummel the target to death using either its fists or its horn. In the chance that the target food is too far away - or too fast - the rajang will expel either a burst or beam of energy, almost always paralyzing or killing the prey, usually instantly. Either way, the result is an easy meal for the Rajang. According to the Guild requests, the bounty for slaying a Rajang is that simillar to a Yama Tsukami's, which indicates that it is really a powerful foe to deal with.