Chestnut-collared Swift is one of the best known species of swift in the Neotropics. Most of what is known about its breeding biology, however, comes from only two regions (Costa Rica and Trinidad); studies from additional regions would be welcome. Questions remain about whether the northern populations of Chestnut-collared Swift are migratory, so its seasonality throughout its range should be better documented. A comprehensive review of geographic variation in Chestnut-collared Swift is overdue, to ascertain how many subspecies (if any) warrant recognition. The diet of Chestnut-collared Swift remains poorly known.