The region’s dangerously cold temperatures could bring some benefits later in the year in the form of a smaller flea and tick population.  But according to entomologist Doug Johnson of the University of Kentucky’s Princeton extension office, they’re resourceful animals.  He says fleas, once indoors on a human or a pet brought in from the cold, can thrive, surviving on waste or debris until they mature.  Johnson says ticks, by contrast, live mostly outdoors, and are more susceptible to cold.