"With the original pony helpless before her, she had all the time in the world to make sure she got every detail exactly right. The pony who called herself Carol, whose real name was apparently True Sight, had been easy to copy in the end. The body of a changeling was literally built for it.

Transforming for the first time had been almost as wonderful as feeding for the first time, and not just because of how it felt. Imitating Carol, changing hard chitin to soft fur, meant more than just taking another body for herself. If she could do it once, she could do it as often as she had the strength. She didnt have to be a freak anymore! She could look like somebody normal, and it would be easier for her to get their attention. It would be easier not to go hungry."

http://www.fimfiction.net/story/277114/36/founders-of-alexandria/part-6—-interlude