I often write about bears, birds, weeds, and ants, so maybe I should change the name of this column to “Mr. Mike’s Nature Corner.” Turtles have become the celebrity creature in our household. For the past several weeks, almost daily, an assortment of box turtles has crawled under the fence into our backyard. At first, we assumed that they, like the occasional bear, were just passing through, but we soon learned that our yard is a destination.