The starkraven are giant scavenger birds that feed almost exclusively off of aberrations. They are prone to attack humanoids, especially tribal folk because of their attempts to kill off the starkravens’ food supply. These birds are highly intelligent but considered somewhat insane. They will die in large numbers sometimes to protect a population of aberrations that is nearing extinction in an area. This has brought about the popular phrase "starkraven mad" to describe someone who is doing something so irrational that it may bring about their own destruction.
Starkravens are not, themselves, an aberration. Their diet adapted to the rise of aberrations and the hunting of them that soon followed given the large numbers of carcasses that resulted.