Hi. I started My career as a biology teacher. Then a business owner. And retired after 37 years in the fire service the last 21 as chief. I have always loved the outdoors. I just recently researched and built a squirrel box. It has taken three weeks of them exploring it. But now I have two grey squirrels who are frantically caring in nesting materials. Eureka. I am elated. Winters are really cold here and I worry about my little buddies. Any advice from you experts will be appreciated. Chief