Tree Swallows Visit

      A few days ago I looked up from my backyard work and saw a couple of Tree Swallows investigating the nest box I had on my fence.


    I was most surprised to see the Tree Swallows as I hadn't seen them in my yard since 1985! In the 1970' I had Tree Swallows nest in the yard for about five years.


     Tree Swallows are common in the area so I'm wondering why they don't visit treed areas in a city.