Papilio polyxenes
In 3 days ~20% in a week ~40%
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 |
With luck
About 10% of wildlife watchers report a Black Swallowtail sighting in San José on a given day, based on 21 verified sightings from GBIF citizen-science data. It is the 67th most-seen of the 239 insects we can rate there. Over three days the chance rises to about 20%, and over a week to about 40%, if each day is a fresh chance.
January–February, April–June and August–November
In those months about 10% of wildlife watchers report a Black Swallowtail in San José on a given day, against under 5% in March, July and December, the lowest months.
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.
24th of 33
Of the 33 cities where we can rate Black Swallowtail sightings, San José ranks 24th at about 10%. The best odds are in Detroit (United States, about 40%), Chicago (United States, about 30%) and Philadelphia (United States, about 30%).
Same genus: Papilio
The closest relatives of the Black Swallowtail that you can see in San José (genus Papilio, Common Swallowtails) are Ruby-Spotted Swallowtail (about 10%) and Thoas Swallowtail (about 10%), with each one's daily chance of a sighting.
GBIF citizen-science records
It is estimated from how often the Black Swallowtail is recorded against all the insects logged in San José (21 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.
