The first step in the preservation process was to pluck out many of the bird’s feathers, which were as valuable as gold. Then the bird’s insides were extracted through its cloaca—an opening through which birds expel eggs and poop. “Taking out the guts helped to remove moisture, which slowed down initial decomposition,” explains José M. Capriles, an anthropologist at Pennsylvania State University. “The guts also contained bacteria. If they were left in the body, the entire corpse would rapidly spoil.”
Finally, the bird was wrapped in cloth and buried. Many of the parrots were mummified with their mouths open and tongues out, like they were squawking. Others had their wings spread as if in flight. The dry desert conditions helped preserve the bodies in these poses for centuries.