(VA) (Arlington Parks) The natural world is constantly changing… yearly, monthly, daily and even hourly. The only way to see it all is to go out on a regular basis and explore. Every 2nd and 4th Wednesday, join a naturalist to briefly meet one of our nature center critters (living or preserved) then go for a walk to see what is out and about this time of year. Learn about the creatures you can see in winter, and focus on healthy walking. Ages 15+.