About a month ago, I discussed the Heat Island Effect (where cities are warmer than their surrounding areas). Well, it turns out that this phenomenon has affected the evolution of the organisms that live in cities, or at the very least, ants. In their paper Urban Physiology: City Ants Possess High Heat Tolerance Angelleta et al. demonstrate that urban ants have a higher heat tolerance than rural ants. Further studies will have to be done on city mice and country mice.