Short afternoon visit to Middlesex Fells Reservation. Lovely weather to be outside among the trees. I have found myself rather reliant on auto focus of late, not the best thing when shooting birds jumping through foliage.
The woodpeckers are either Downy (Picoides pubescens) or Hairy (Picoides villosus) Woodpeckers. According to The Sibley Guide to Birds, the key differences are size and habitat. Downy woodpeckers are quite small with a stout bill. The Hairy Woodpecker is large and prefers mature woods. I do not believe the area around the reservoir qualify as mature woods. Keeping these things in mind, I am leaning toward the Downy identification.