Stone harpies

Stone harpies are a variety of enchanted statues in the shape of harpies which are capable of movement and even flight. They appear in Ultima VII and Ultima VII Part Two.

Description
It is unknown when these constructs were first developed, but they appeared in both Britannia and on Serpent Isle as magical guards, standing stationary until such time as they were approached by intruders. While some sources claim that they originated with the eccentric Martingo of Spektran, several specimens could be found throughout New Sosaria, making their exact origins hard to pinpoint.

Trivia

 * The stone harpy in Ultima VII is immune to magic weapons, meaning that it can only be hurt by regular weapons. Due to the encounter happening late in the game, the player probably no longer has such and nothing hints at the need for non-magical weaponry.