Something as simple as feeding birds can change their biological fate, and even seed the formation of a new species.
Central European blackcap warbler that spend the winter in the birdfeeder-rich United Kingdom are on a different evolutionary trajectory than those that migrate to Spain. The population hasn’t yet split into two species, but it’s headed in that direction.
read more Feeding birds could create new species
More information:
British bird-feeders may be splitting species
Contemporary Evolution of Reproductive Isolation and Phenotypic Divergence in Sympatry along a Migratory Divide ( pdf $ )
