BBC: Temperature tolerance is key to the spread of wasp spiders into northern Europe, according to scientists.
Since the 1930s the distinctive spiders have expanded their range from the Mediterranean coast to Norway.
Researchers in Germany traced the population boom to breeding between the native European spiders and an isolated colony living near the Black Sea.
Molecular Ecology reports the genetic mixing resulted in generations rapidly adapting to living in colder climates.
Wasp spiders...