The Springer Mound Monsters
From Tatters of the King

Two large winged creatures circling endlessly above Springer Mound near Clare Melford. One of these creatures attacked and killed Harold Jennings after he discharged a shotgun into one of the nine obelisks hidden on his land. It also hunted down and killed both of his dogs and the unfortunate local constable from Long Melford. The creature was clearly seen by both Andrew Saunders and Nathaniel Browne, but attacked neither of them. As far as anyone knows, the creatures are still there. The police believed the attacks were the work of the dogs who eventually killed each other.
Saunders described the creature as a man-sized insectoid horror with a head like a horse's skull. It had sharp claws on all four limbs, great leathery wings and dead grey eyes.