How to cheat evolution? No specific spell names came to mind for the Ravenclaw, but a situation in history certainly did, so he raised his hand and waited to be called on. "You can transfigure yourself", or someone else if not alone, "or a body part into something that would already be better suited for the environment. Like in the Triwizard Tournament, for the second task Viktor Krum turned his head into a shark so he could breathe underwater." Genius if you asked him. Though he didn't know what the spell was, and he was secretly hoping the Professor would offer that.