I recall hearing something about somebody or somebodies not believing that 'caramel' came from a non-hybrid corn. Those somebodies were speculating there was yellow rat involved, or something similar...
That may be your breeder's source of information on this. It's pretty much accepted that caramel came from a cornsnake these days, but there WAS some controversy a few years ago. (Actually, it was pretty much accepted back then too... just a few people making noises...)
-Kat