Feral organism Harmful and helpful effects of feral organisms Genetic pollution
 Domestic animals can breed with native, wild animals. This interbreeding can threaten the existence of the original wild population. Another example is the dingo, itself an early feral dog, which interbreeds with dogs of other origin. However it is unlikely that this will harm the ecosystems in which these dogs live and some regard the importance of this phenomenon as disputable. In some cases like rabbits, the interbreeding seems not to be noticed. There is much debate over the effect of interbreeding on changes to the genes of a wild species.