There's this program on Discovery right now (Dinosaurs: Return to Life?) where a researcher is injectin a virus into a chicken egg and essentially turning off a supression gene. The result is a chick with teeth. http://www.sciam.com/article.cfm?id=mutant-chicken-grows-alli They didn't say that they allowed the chicks to hatch. Can you imagine a chicken with teeth?!?! They're dangerous enough with just beaks!!