Throughout the ancient world, there are depictions of mysterious figures that appear to be half human and half bird. In many cultures, they are revered as divine and have magical abilities.
Rapa Nui (Easter Island Moai)
Chile · Polynesian (Rapa Nui)
Ancient Aliens proposes the massive moai statues required alien technological assistance due to their size and precision. The show speculates that the Birdman cult represented contact with extraterrestrial visitors.