Ravenhunters are dragons mentioned in How to Betray a Dragon's Hero
Ravenhunters are small dragons with a pair of wings and a spaded tail. They are depicted as being solid black with greenish wing membranes.
Ravenhunters have excellent eyesight. They are also fast dragons, rating an "8".
Ravenhunters have a fondness for scallops, and can switch sides in a conflict from their greed for them. This fondness might also be conceivably be used against them.
Excellinor the Witch uses Ravenhunter dragons as spies. They are also used by Vikings as messengers and hunting dragons.
Ravenhunters appear in Book 11 as spies for Excellinor the Witch.
Ravenhunters are discussed in this reference book and appear in the Dragon Key located at the back of the book.