Antrostomus vociferus
Silhouette: Sheatherius · PhyloPic
In 3 days <5%
The eastern whip-poor-will (Antrostomus vociferus; also called "whip-o-will", "whip o' will", etc.) is a medium-sized (22–27 cm or 8.7–10.6 in) bird within the nightjar family, Caprimulgidae, from North America. The whip-poor-will is commonly heard within its range, but less often seen because of its camouflage. It is named onomatopoeically after its song.
This medium-sized nightjar measures 22–27 cm (8+1⁄2–10+1⁄2 in) in length, spans 45–50 cm (17+1⁄2–19+1⁄2 in) across the wings and weighs 42–69 g (1+1⁄2–2+7⁄16 oz). Further standard measurements are a wing chord of 14.7 to 16.9 cm (5+13⁄16 to 6+5⁄8 in), a tail of 10.5 to 12.8 cm (4+1⁄8 to 5+1⁄16 in), a bill of 1 to 1.4 cm (3⁄8 to 9⁄16 in) and a tarsus of 1.5 to 1.8 cm (9⁄16 to 11⁄16 in). Adults have mottled plumage: the upperparts are grey, black and brown; the lower parts are grey and black. They have a very short bill and a black throat. Males have a white patch below the throat and white tips on the outer tail feathers; in the female, these parts are light brown.
This bird is sometimes confused with the related chuck-will's-widow (Antrostomus carolinensis) which has a similar but lower-pitched and slower call.... Wikipedia →
| # | Park | Country | Daily sighting probability |
|---|---|---|---|
| 1 | Point Pelee National Park | 🇨🇦 Canada | |
| 2 | Great Smoky Mountains National Park | 🇺🇸 United States | |
| 3 | Everglades National Park | 🇺🇸 United States | |
| 4 | Shenandoah National Park | 🇺🇸 United States | |
| 5 | Big Cypress National Preserve | 🇺🇸 United States | |
| 6 | Merritt Island National Wildlife Refuge | 🇺🇸 United States |
| # | City | Country | Daily sighting probability |
|---|---|---|---|
| 1 | Chicago | 🇺🇸 United States | |
| 2 | Baltimore | 🇺🇸 United States | |
| 3 | Houston | 🇺🇸 United States | |
| 4 | Detroit | 🇺🇸 United States | |
| 5 | Miami | 🇺🇸 United States | |
| 6 | San Antonio | 🇺🇸 United States | |
| 7 | Toronto | 🇨🇦 Canada | |
| 8 | Washington | 🇺🇸 United States | |
| 9 | Austin | 🇺🇸 United States | |
| 10 | New York City | 🇺🇸 United States |
Rare
Under 5% of wildlife watchers report an Eastern Whip-poor-will sighting in San Antonio on a given day, based on 8 verified sightings from GBIF citizen-science data. It is the 245th most-seen of the 255 birds we can rate there. Over three days the chance rises to under 5%, if each day is a fresh chance.
Any time of year
In every month with enough records, under 5% of wildlife watchers report an Eastern Whip-poor-will in San Antonio on a given day, so our monthly data shows no clear season.
Between 8 and 11 pm
Across all the parks we cover, that three-hour window holds the most Eastern Whip-poor-will sightings with a recorded time, and about 9 in 10 of them come between 6 pm and 6 am: it is mostly seen at night.
Among the best
Of the 11 cities where we can rate Eastern Whip-poor-will sightings, San Antonio ranks 6th at under 5%, level with the leaders once rounded. The best odds are in Chicago (United States, under 5%), Baltimore (United States, under 5%) and Houston (United States, under 5%).
GBIF citizen-science records
It is estimated from how often the Eastern Whip-poor-will is recorded against all the birds logged in San Antonio (8 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.
