This was on Wikipedia, so for what it's worth....here goes.....
In the Aliens vs. Predator novel series based on the Dark Horse Comics by David Bischoff, Steve and Stephani Perry, the Predators, known in the series as "Yautja", are depicted as living in a matriarchal clan-based society bearing similarities to a pack mentality, with the stronger and most skilled of the group being leader. The Predators are portrayed as sexually dimorphic mammals, with females being larger and stronger than males[15] and sporting more prominent mammary glands (like human females).[5] Both genders give off a strong musk to signify aggression, while females can also emit it when in estrus. This musk can be detected by other Predators and canids, though it is imperceptible to humans.[5] Predators in the Perry novels are not monogamous, and it is not uncommon for veteran warriors to sire hundreds of offspring (known as sucklings) with multiple mates.[5] It is also revealed that their blood has the capacity of partially neutralizing the acidity of Alien blood.[5] Their religion is partially delved upon in the series, showing that they are polytheistic, and that their equivalent of the Grim Reaper is the so called "Black Warrior", who is seen as an eternal adversary who eventually wins all battles.[5]
Predator veterans at a celebratory feast in Aliens versus Predator: Chained to Life and Death.
Though female Predators are occasionally referred to in Steve and Stephani Perry's novel series, one does not make an actual appearance until the graphic novel Aliens vs Predator: Deadliest of Species. The female's design however contradicts the descriptions given in the Perry novel series, as it superficially shows little distinction from males.[16]
In Randy Stradley's graphic novel Aliens vs. Predator: War, it is revealed through the narration of the character Machiko Noguchi that Predators were responsible for the spread of Aliens throughout the galaxy, though the Predators themselves deny this, stating that their large interplanetary distribution is due to simultaneous convergent evolution.[17]
In John Shirley's stand alone novel Predator: Forever Midnight, Predators, now referred to as "Hish", are shown to possess a gland located between their neck and collarbone which secretes powerful hormones into their bloodstream and which drives them to hyper-aggression. 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. This "kill rage" can be contagious and spread from one Predator to another, driving them all to attack each other. The Predators as a species barely survived the wars provoked by their kill glands, and they have learned to control the gland's secretions with artificial hormone regulators.[6]
In John Vance's graphic novel Predator Homeworld, it is revealed that Predators breathe 1% more oxygen, and 4% more nitrogen than humans, and that they are capable of adapting themselves to Earth's atmosphere for one week at the most if deprived of a breathing apparatus.[18] In Ian Edginton and Alex Maleev's graphic novel Aliens vs. Predator: Eternal and the videogame Predator: Concrete Jungle, Predator flesh and blood, if consumed, is shown to have the capacity of greatly lengthening a human's lifespan.[19]