Red-bellied woodpeckers aren’t just expanding north into areas that now have the milder winter temperatures they are used to. The birds are expanding beyond their previous comfort zone and have somehow adapted to survive colder winters. I can relate. The climate hasn’t quite warmed enough to make winters in Northern Wisconsin comparable to the weather I grew up with in Iowa, but I’ve tweaked my wardrobe and thickened my blood enough to make the cold survivable.