Howdy. Freewave here told me about this little thread here. I'm the author of 'A Change of Face', and I'm very happy that it has inspired someone to create wonderful music based off of it, as well as spark a discussion about these sweet little bug-ponies. I also happen to be part of a MLP roleplay group on Second Life, and I wrote what we use as the group's 'canon' about changelings, since not a lot of inside information has come from the show or comics yet. Since someone brought up the idea of discussing the biology and such of changelings, I thought I'd post up our 'canon' informate on them from our group. In a way, it's an expansion on what I had in mind when I was writing 'A Change of Face'. I know it won't fit with everyone's own 'head-canon', but I wanted to share it all the same. And yes, I do play a changeling in our RP group. She's a sweet little thing named Soubrette who's adopted one (soon to be two possibly) homeless foals, and tries to be a loving and protective mother while living peacefully (as peacefully as she can in Ponyville) on her foals' love.