Chaetura pelagica
Silhouette: Aviceda (vectorized by T. Michael Keesey) · PhyloPic
In 3 days ~40% in a week ~80%
The chimney swift (Chaetura pelagica) is a bird belonging to the swift family Apodidae. A member of the genus Chaetura, it is closely related to both Vaux's swift and Chapman's swift; in the past, the three were sometimes considered to be conspecific. It has no subspecies. The chimney swift is a medium-sized, sooty gray bird with very long, slender wings and very short legs. Like all swifts, it is incapable of perching on flat surfaces, and can only perch on vertical surfaces. Many fly around all day and only come down at night when roosting.
The chimney swift feeds primarily on flying insects, but also on airborne spiders. It generally mates for life. It builds a bracket nest of twigs and saliva stuck to a vertical surface, which is almost always a human-built structure, typically a chimney; historically (before European colonists built chimneys), they nested in hollow trees (including old pileated woodpecker nest holes), a few still do so, though only rarely. The female lays 4–5 white eggs. The altricial young hatch after 19 days and fledge a month later. The average chimney swift lives 4.6 years.
When Carl Linnaeus first described the chimney swift... Wikipedia →
| # | City | Country | Daily sighting probability |
|---|---|---|---|
| 1 | Baltimore | 🇺🇸 United States | |
| 2 | Chicago | 🇺🇸 United States | |
| 3 | Philadelphia | 🇺🇸 United States | |
| 4 | Washington | 🇺🇸 United States | |
| 5 | Houston | 🇺🇸 United States | |
| 6 | Boston | 🇺🇸 United States | |
| 7 | New York City | 🇺🇸 United States | |
| 8 | Dallas | 🇺🇸 United States | |
| 9 | Austin | 🇺🇸 United States | |
| 10 | Orlando | 🇺🇸 United States |
Possible
About 20% of wildlife watchers report a Chimney Swift sighting in Austin on a given day, based on 4,199 verified sightings from GBIF citizen-science data. It is the 39th most-seen of the 277 birds we can rate there. Over three days the chance rises to about 40%, and over a week to about 80%, if each day is a fresh chance.
May to July
In those months about 40% of wildlife watchers report a Chimney Swift in Austin on a given day, against under 5% in November to March, the lowest months.
Between 7 and 10 am
Across all the parks we cover, that three-hour window holds the most Chimney Swift sightings with a recorded time, and about 7 in 10 of them come between 6 am and 6 pm: it is a daytime animal.
9th of 19
Of the 19 cities where we can rate Chimney Swift sightings, Austin ranks 9th at about 20%. The best odds are in Baltimore (United States, about 30%), Chicago (United States, about 30%) and Philadelphia (United States, about 30%).
GBIF citizen-science records
It is estimated from how often the Chimney Swift is recorded against all the birds logged in Austin (4,199 verified sightings), calibrated against known sighting rates. Figures are rounded to the nearest 10% because citizen-science data supports honest approximations, not decimals, and months with records from fewer than five people show "—". How it works.
