The white-collared swift is the largest species of swift in its range except in northwestern Mexico, where it and the slightly larger white-naped swift (S. semicollaris) are sympatric. The white-collared swift is 20 to 21.5 cm (7.9 to 8.5 in) long and weighs 90 to 125 g (3.2 to 4.4 oz). It has a wingspan of 45 to 55 cm (18 to 22 in). It has a very slightly forked tail and the sexes have the same plumage. Adults have a white collar that circles the neck and is broadest on the breast. Their forehead is sooty, most of the head dark sooty black, the tail grayish black, and the rest of the plumage black. The back, rump, and uppertail coverts have a slight blue gloss. Juveniles are duller and sootier than adults and have grayish white to white tips on most of their body feathers. There are minor differences among the subspecies in the width of the white collar, the shades of black on the body and tail, and the amount of white fringing on the juvenile.[5]
The species has also been noted as a vagrant on Aruba but which subspecies is not known.[4] Further north it has also occurred as a documented vagrant in Texas and Florida and there are sight records from California, Michigan, and several locations in northern Mexico.[6]
The white-collared swift inhabits a large variety of landscapes. It is most common over montane and submontane evergreen forests, and is also found over lowland evergreen forests, secondary forests, and more open habitats like scrublands. In elevation, it ranges from lowlands to 3,600 m (11,800 ft).[5]
The only documented predation on white-collared swifts was by Virginia opossums, which raid and eat the young in nests, and peregrine falcons, which are known to wait near colony entrances to take birds as they enter or leave.[7]
The white-collared swift is usually considered to be resident throughout its range. However, it has many times been documented beyond its usual northern limit and also makes significant movements to lower elevations to escape bad weather.[5]
Like all swifts, the white-collared is an aerial insectivore. Details of its diet are lacking, but a pair of specimens from southern Mexico had fed almost exclusively on flying ants. It often feeds in flocks of 200 or more that sometimes include other swift species. It has a powerful, fast, and direct flight, and will ascend thermals to great heights. White-collared swifts attain or exceed flying speeds of 70 to 100 km/h (43 to 62 mph).[5][8][9]
The white-collared swift's nesting season in southern Mexico and Costa Rica includes at least April and May; it has not been documented elsewhere. It nests in colonies within caves, which often contain a stream or are behind a waterfall. It builds its nest on a ledge or other protrusion or in a niche, sometimes behind a waterfall. Nests are flattish circles made from some or all of mud, moss, and insect chitin lined with leaves or fern fronds; the materials used can differ between colonies. In two studies they measured 120 to 170 mm (4.7 to 6.7 in) in diameter with depths of 30 to 90 mm (1.2 to 3.5 in). The clutch size is two eggs. The incubation period and time to fledging are not known; nestlings become independent 45 to 55 days after hatch.[5][8][7][9]
The white-collared swift's vocalizations have been described as "nasal twitter of chee chee chee, whiss whiss" and "scratchy but not shrill tseet, tchee, and chirrio notes". Flock members may call in unison.[5] A flock makes "an impressive swooshing rush of air" when rapidly descending, as down a valley.[10]
The IUCN has assessed the white-collared swift as being of Least Concern. It has an extremely large range and an estimated population of at least five million mature individuals, though the population is believed to be decreasing. No immediate threats have been identified.[1] "Populations are not known to be affected by humans."[5]
^ abcRemsen, J. V., Jr., J. I. Areta, E. Bonaccorso, S. Claramunt, A. Jaramillo, D. F. Lane, J. F. Pacheco, M. B. Robbins, F. G. Stiles, and K. J. Zimmer. Version 24 July 2022. Species Lists of Birds for South American Countries and Territories. https://www.museum.lsu.edu/~Remsen/SACCCountryLists.htm retrieved July 24, 2022
^ abcdefghRoper, E. M. (2020). White-collared Swift (Streptoprocne zonaris), version 1.0. In Birds of the World (T. S. Schulenberg, Editor). Cornell Lab of Ornithology, Ithaca, NY, USA. https://doi.org/10.2173/bow.whcswi.01 retrieved October 2, 2022
^ abWhitacre, D. (1989) Conditional use of nest structures by White-naped and White-collared Swifts. The Condor, vol. 91, no. 4, pp. 813 - 825
^ abMarín A., M., and F. G. Stiles. 1992. On the biology of five species of swifts (Apodidae, Cypseloidinae) in Costa Rica. Proceedings of the Western Foundation of Vertebrate Zoology 4: 287-351.
^ abRowley, J. S. and Orr, R. T. (1965) Nesting and Feeding Habits of the White-Collared Swift. The Condor, vol. 67, no. 6, pp. 449 - 456
^Hilty, S. L. (2003) Birds of Venezuela. Second edition. Princeton University Press, Princeton, New Jersey.
Fjeldsa, J. and Krabbe, N. (1990) Birds of the high Andes: a Manual to the Birds of the Temperate Zone of the Andes and Patagonia, South America. Apollo Books, Copenhagen, Denmark
