The BBC reports that blackcaps appear to be noticeable splitting into those that overwinter in the UK to avail themselves of our bird feeders, and those that don't. The birds that feed in the UK are developing shorter, rounder wings since they don't have to fly so far, and longer thinner beaks all the better for getting food out of those feeders. Crucially, the two sets of birds are tending not to breed with each other, setting the scene for an eventual species split.

Is this good or bad? Should we be shaping nature in such a way? Isn't mankind just another species on the face of the planet and part of the rich soup of interactions that cause some species to die out and new ones to appear?

Personally I'm hoping for a new species of wood pigeon that can mimic a cat.