Chimney swifts at Bradford Bog

[Bill Duffy]

We live adjacent to the Bradford Bog - one of only a half-dozen houses along this stretch of road. Late yesterday afternoon a group of 4 chimney swifts appeared, circling our field for about two hours. They seemed somewhat interested in our 2 flue fieldstone chimney, often swooping down close to inspect it. I frequently see swifts in "downtown" Bradford - about six miles away. But how did this group end up here? There are several tall dead pine stumps out in the bog. Could they be using these for nesting/roosting?