That sounds even worse. Though such things do exist so maybe that would just be personal experience speaking.

"Overpopulation. They turned from helpful to being pests."

She knows how the Ancients worked. That they curated their world, introducing creations into nature after rigorous testing. It's still such a strange concept to her, but she images he'd find that various creatures have always been there as being just as strange.

"Introducing a creature to a new environment isn't commonly done."