After birding at Hall's Pond in Brookline, where I saw a Black and White Warbler, I found myself walking along Crowningshield St. and Elba Rd. I was not birding at this time. I was quite surprised to hear a Blue-gray Gnatcatcher on a sidewalk tree. I whipped out my binoculars and saw the bird. Then, a few steps away, a Yellow-bellied Sapsucker flew into an evergreen tree at the next property.
