The Scottish wildcat, Felis silvestris silvestris, is related to other species of wildcats in Europe, but has been wiped out in England and Wales. Only about 400 animals remain, according to researchers at the Edinburgh Science Triangle. Researchers believe the cats could be extinct by 2050. The purity of their gene pool is threatened by interbreeding with feral domestic cats, which has sparked an effort to spray the cats for free. It turns out that this hybridization could actually be the wildcats' salvation, according to embryologist Bill Ritchie.