additional information

Succubi
Mentioned in the Twilight series is the Denali vampire coven, which consists of Tanya, Irina, Katrina (Kate), Carmen, and Eleazar. Carmen and Eleazar are mates, but Tanya, Irina, and Kate are vampires that could be considered as succubi in a sense. As we know, succubi are demonic seductresses who prey on human men, drawing blood from the men to sustain their existence. But, Tanya, Irina, and Kate are considered to be “vegetarian” vampires just like the Cullens—they feast on only animal blood. Their fondness for human men eventually led them to feel remorse for their victims, and they slowly trained themselves to resist human blood, although they continue to seduce the men.

Enemies of Werewolves  
In the Twilight universe (much like many traditional legends), vampires are natural enemies of werewolves. The werewolves on the reservation in La Push consider themselves the “protectors,” in that they are protecting the humans from the vampires. According to their legends, the werewolves were crated in order to destroy the vampires.  
Some of the younger members of the tribe don’t seem to believe the legends, and dismiss it easily.
In the Twilight series, a treaty has been created to ensure that the Cullens stay away from the Quileutes and their land. This treaty was created because the Cullens insisted (due to their “vegetarian” diet), that they were not a threat to the humans. Thus, a truce was created so that if any one of the Cullens bites, changes, or kills a human, or crosses the border of the reserve that was enforced, then the truce is over, and the war between the vampires and the werewolves will start up once more. There is no geographical distance limit to where the Cullens can bite, change, or kill a human. Conversely, the Quileutes do not tell anyone that the Cullens are really vampires—doing so would be breaking the treaty as well.