You mean there's no evidence that breeding fruit flies for generation after generation leads only to more fruit flies? What else has ever come from such breeding?
Fruit flies that play hard to get. *rimshot*
If speciation in multicellulars doesn't mean "can't breed together", than what does it mean. It this an new creationist micro-macro theory: all multicellulars are one species?
Actually, there has been speciation observed in fruit flies in the wild. Someone just posted the article on this thread or another one rather recently.