Many of the eggs from the Poplar hawk female were infertile but some did hatch, I reared the larvae successfully to the adult moths, some of the resulting moths were Gynandromorphs half female and half male, as my photograph clearly shows it is female on the left with the thin antenna and the male on the right. There have been reports of some hybrids accuring in the wild naturally, which I suppose is possible as they do sometimes feed on the same food-plants, many entomologists try breeding different hybrids and many of these are well known. Although I have now some very interesting pictures, the resulting sterile moths I bred had a mixture of both species, but the resulting moths to me were a disappointment with to many abnormalities, the moths also not as colorful as the original parents. Which I think proves you just cannot improve the beauty of Nature.