Clone army steals genes from other species

Anyone who thinks that invading clone armies are the preserve of science fiction should think again. One is marching across Europe and north America at this very moment.

The clones in question are Asian clams, or Corbicula fluminea, a species of freshwater mollusc that originated in China and Taiwan. They aren't popular in their new homes, clogging up water intake pipes and outcompeting native clams. But they have some remarkable sexual talents.