Oncopeltus fasciatus
In 3 days ~10% in a week ~30%
Oncopeltus fasciatus, known as the large milkweed bug, is a medium-sized hemipteran (true bug) of the family Lygaeidae. It is distributed throughout North America, from Central America through Mexico and the Caribbean to southern areas in Canada. Costa Rica is the southern limit of its range. It inhabits disturbed areas, roadsides, and open pastures. Due to this widespread geographic distribution, the large milkweed bug exhibits varying life history trade-offs depending on the population location, including differences in wing length and other traits based on location.
Adults can range from 11 to 12 mm in length and have a red/orange and black X-shaped pattern on their wings underneath the triangle that is typical to hemipterans. This feature makes the bug easily seen, acting as an aposematic warning to predators. O. fasciatus exhibits Müllerian mimicry and is noxious to predators. The ventral side of the fourth abdominal segment bears a black band in the male and two black spots in the female. Juveniles are born mostly red with black antennae and a few black spots, throughout growth the black spots are developed as well as wing pads. The eggs are bright orange... Wikipedia →
| # | Park | Country | Daily sighting probability |
|---|---|---|---|
| 1 | Shenandoah National Park | 🇺🇸 United States | |
| 2 | Point Pelee National Park | 🇨🇦 Canada | |
| 3 | Great Smoky Mountains National Park | 🇺🇸 United States | |
| 4 | El Vizcaíno Biosphere Reserve | 🇲🇽 Mexico | |
| 5 | Grand Canyon National Park | 🇺🇸 United States | |
| 6 | Padre Island National Seashore | 🇺🇸 United States | |
| 7 | Saguaro National Park | 🇺🇸 United States | |
| 8 | Zion National Park | 🇺🇸 United States | |
| 9 | Sequoia and Kings Canyon National Parks | 🇺🇸 United States | |
| 10 | Merritt Island National Wildlife Refuge | 🇺🇸 United States | |
| 11 | Channel Islands National Park | 🇺🇸 United States | |
| 12 | Big Bend National Park | 🇺🇸 United States | |
| 13 | Cumbres de Monterrey National Park | 🇲🇽 Mexico | |
| 14 | Everglades National Park | 🇺🇸 United States | |
| 15 | Joshua Tree National Park | 🇺🇸 United States |
| # | City | Country | Daily sighting probability |
|---|---|---|---|
| 1 | Chicago | 🇺🇸 United States | |
| 2 | Washington | 🇺🇸 United States | |
| 3 | Baltimore | 🇺🇸 United States | |
| 4 | New York City | 🇺🇸 United States | |
| 5 | Philadelphia | 🇺🇸 United States | |
| 6 | Detroit | 🇺🇸 United States | |
| 7 | Ciudad Juárez | 🇲🇽 México | |
| 8 | Dallas | 🇺🇸 United States | |
| 9 | Minneapolis [Saint Paul] | 🇺🇸 United States | |
| 10 | Austin | 🇺🇸 United States |
Rare
Under 5% of wildlife watchers report a Large Milkweed Bug sighting in Sacramento on a given day, based on 26 verified sightings from GBIF citizen-science data. It is the 154th most-seen of the 386 insects we can rate there. Over three days the chance rises to about 10%, and over a week to about 30%, if each day is a fresh chance.
January and June–September
In those months about 10% of wildlife watchers report a Large Milkweed Bug in Sacramento on a given day, against under 5% in February–May and October–December, the lowest months. Those are among Sacramento's driest months, with about 20 mm of rain a month against 120 mm in December.
Between 11 am and 2 pm
Across all the parks we cover, that three-hour window holds the most Large Milkweed Bug sightings with a recorded time, and about 9 in 10 of them come between 6 am and 6 pm: it is a daytime animal.
28th of 30
Of the 30 cities where we can rate Large Milkweed Bug sightings, Sacramento ranks 28th at under 5%. The best odds are in Chicago (United States, about 20%), Washington (United States, about 20%) and Baltimore (United States, about 20%).
GBIF citizen-science records
It is estimated from how often the Large Milkweed Bug is recorded against all the insects logged in Sacramento (26 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.
