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These Predators barely survived the wars provoked by their kill glands, and they have learned to control the gland's secretions with artificial hormone regulators. This "kill rage" can be contagious and spread from one Predator to another, driving them all to attack each other.
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When this gland is over-stimulated, it sends the creatures into a frenzied rage, causing them to attempt killing any living thing in sight, including members of their own species. Some Predators, referred to as "Hish", have been known to possess a gland located between their neck and collarbone which secretes powerful hormones into their bloodstream and which drives them to hyper-aggression. Dachande even nicknames Machiko Noguchi "Da'dtou-di", which is the feminine form of that name. Male names often end with 'e' (i.e: Dachande, Tichinde, Skemte, Nakande, ect.) while female names tend to end with 'i' (i.e: Vagouti, Hashori). The Yautja society appears to be a heavily gendered one even the names of the Predators tend to have masculine and feminine connotations, similar to many romantic language such as spanish.
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It is also speculated that the Xenomorphs may have been an Engineer weapon against the Yaujta. In AVP Requiem, an Engineer helmet is shown as a Predator war trophy. Speculation has it that the Engineers and Yautja may have been adversaries.