He blinks and thinks about it for a few seconds. "Well, prodding my brain, it seems like I just assumed singing mustard must be mostly artificial, because muggles have had a lot of success creating artificial plants and not so much artificial sapient beings. I mean, the only instance I knew of of sapient beings was humans, and humans just evolved, so that's my starting point for other sapient beings, whereas it would surprise me not one bit if wizardkind made singing mustards. Actually, I'd be quite surprised if I found out we hadn't."