Papilio polyxenes
In 3 days ~40% in a week ~70%
Papilio polyxenes, the (eastern) black swallowtail, American swallowtail or parsnip swallowtail, is a butterfly found throughout much of North America. An extremely similar-appearing species, Papilio joanae, occurs in the Ozark Mountains region, but it appears to be closely related to Papilio machaon, rather than P. polyxenes. The species is named after the figure in Greek mythology, Polyxena (pron.: /pəˈlɪksɨnə/; Greek: Πολυξένη), who was the youngest daughter of King Priam of Troy. Its caterpillar is often called the "parsleyworm" because the caterpillar feeds on parsley.
The Papilio polyxenes demonstrates polyandry and a lek mating system, showing no male parental care and display sites. Females are therefore able to choose males based on these sites and males are the only resource the females find at these sites.
Papilio polyxenes is part of the tribe Papilionini of the swallowtail butterfly family, Papilionidae. The members of this tribe all have tails on the hindwings, and therefore include species named swallowtail. P. polyxenes is part of the genus Papilio, which is the biggest group of the family Papilionidae. Subspecies polyxenes, once found in Cuba, is now... Wikipedia →
| # | Park | Country | Daily sighting probability |
|---|---|---|---|
| 1 | Joshua Tree National Park | 🇺🇸 United States | |
| 2 | Guadalupe Mountains National Park | 🇺🇸 United States | |
| 3 | Death Valley National Park | 🇺🇸 United States | |
| 4 | Everglades National Park | 🇺🇸 United States | |
| 5 | Big Bend National Park | 🇺🇸 United States | |
| 6 | Grand Canyon National Park | 🇺🇸 United States | |
| 7 | Lago de Yojoa | 🇭🇳 Honduras | |
| 8 | Shenandoah National Park | 🇺🇸 United States | |
| 9 | Point Pelee National Park | 🇨🇦 Canada | |
| 10 | Volcán Barú National Park | 🇵🇦 Panama | |
| 11 | Cumbres de Monterrey National Park | 🇲🇽 Mexico | |
| 12 | Merritt Island National Wildlife Refuge | 🇺🇸 United States | |
| 13 | Congaree National Park | 🇺🇸 United States | |
| 14 | Acadia National Park | 🇺🇸 United States | |
| 15 | Saguaro National Park | 🇺🇸 United States | |
| 16 | Monteverde Cloud Forest Reserve | 🇨🇷 Costa Rica | |
| 17 | La Amistad International Park (Panama) | 🇵🇦 Panama | |
| 18 | Great Smoky Mountains National Park | 🇺🇸 United States |
| # | City | Country | Daily sighting probability |
|---|---|---|---|
| 1 | Detroit | 🇺🇸 United States | |
| 2 | Chicago | 🇺🇸 United States | |
| 3 | Philadelphia | 🇺🇸 United States | |
| 4 | Minneapolis [Saint Paul] | 🇺🇸 United States | |
| 5 | Puebla | 🇲🇽 México | |
| 6 | Toronto | 🇨🇦 Canada | |
| 7 | Montreal | 🇨🇦 Canada | |
| 8 | Toluca | 🇲🇽 México | |
| 9 | Austin | 🇺🇸 United States | |
| 10 | Mexico City | 🇲🇽 México |
Possible
About 20% of wildlife watchers report a Black Swallowtail sighting in Death Valley National Park on a given day, based on 21 verified sightings from GBIF citizen-science data from 2019 to 2026. It is the 25th most-seen of the 108 insects we can rate there. Over three days the chance rises to about 40%, and over a week to about 70%, if each day is a fresh chance.
April and September
In those months about 30% of wildlife watchers report a Black Swallowtail in Death Valley National Park on a given day, against under 5% in January, June–August and October–November, the lowest months. Those are among Death Valley National Park's driest months, with about 10 mm of rain a month against 30 mm in March.
Between 10 am and 1 pm
Across all the parks we cover, that three-hour window holds the most Black Swallowtail sightings with a recorded time, and about 9 in 10 of them come between 6 am and 6 pm: it is a daytime animal.
3rd of 18
Of the 18 parks where we can rate Black Swallowtail sightings, Death Valley National Park ranks 3rd at about 20%. The best odds are in Joshua Tree National Park (United States, about 30%) and Guadalupe Mountains National Park (United States, about 20%).
GBIF citizen-science records
It is estimated from how often the Black Swallowtail is recorded against all the insects logged in Death Valley National Park (21 verified sightings from 2019 to 2026), 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.
