I don't have the Birds of North America monograph on the Chimney Swift, nor
Bent, to check for answers to the following questions. Can anyone help?

Am I correct in assuming that the Chimney Swift nests colonially?

If they don't nest colonially, do they roost colonially away from the
nesting site even after nests have been built, but before eggs are laid?

During brooding, does the non-brooding (probably male) member of a pair
roost in the nest chimney, or does it go to a colonial roost with other
non-brooders and, perhaps, non-breeders?

There is presently a roost of ca. 30+ (I didn't stand around and do a full
count) birds in a local church chimney. The species is well within the safe
dates for the Atlas. Hence the questions.

Charles Vaughn
1306 Frederick Avenue
Salisbury, MD 21801