Leptoglossus occidentalis
In 3 days ~30% in a week ~50%
The western conifer seed bug (Leptoglossus occidentalis), sometimes called the pine-beetle, or abbreviated as WCSB, is a species of true bug (Hemiptera) in the family Coreidae. It is native to North America west of the Rocky Mountains (California to British Columbia, east to Idaho, Minnesota, and Nevada) but has in recent times expanded its range to eastern North America, to include Ontario, Québec, New Brunswick, Nova Scotia, Prince Edward Island, Michigan, Maine, Pennsylvania, New York, New Jersey, Connecticut, Massachusetts, Rhode Island, New Hampshire, Vermont, Ohio, Indiana, Kentucky, and Wisconsin, and has become an accidental introduced species in parts of Europe and Argentina.
This species is a member of the insect family Coreidae, or leaf-footed bugs, which also includes the similar Leptoglossus phyllopus and Acanthocephala femorata, both known as the "Florida leaf-footed bug". Western conifer seed bugs are sometimes colloquially called stink bugs. While they do use a foul-smelling spray as a defense, they are not classified in the stink bug family Pentatomidae. In Chile, it has been confused with kissing bugs (Triatominae), causing unjustified alarm.
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| # | Park | Country | Daily sighting probability |
|---|---|---|---|
| 1 | Cape Breton Highlands National Park | 🇨🇦 Canada | |
| 2 | Acadia National Park | 🇺🇸 United States | |
| 3 | Cévennes National Park | 🇫🇷 France | |
| 4 | Wadden Sea National Park | 🇩🇪 Germany | |
| 5 | Bavarian Forest National Park | 🇩🇪 Germany | |
| 6 | Picos de Europa National Park | 🇪🇸 Spain | |
| 7 | Nahuel Huapi National Park | 🇦🇷 Argentina | |
| 8 | Tatra National Park | 🇸🇰 Slovakia | |
| 9 | Sierra de Guadarrama National Park | 🇪🇸 Spain | |
| 10 | Sierra Nevada National Park | 🇪🇸 Spain | |
| 11 | Triglav National Park | 🇸🇮 Slovenia | |
| 12 | Pyrénées National Park | 🇫🇷 France | |
| 13 | Fertő-Hanság National Park | 🇭🇺 Hungary | |
| 14 | Glacier National Park | 🇺🇸 United States | |
| 15 | Great Bear Rainforest | 🇨🇦 Canada | |
| 16 | Zion National Park | 🇺🇸 United States | |
| 17 | Rocky Mountain National Park | 🇺🇸 United States | |
| 18 | Yosemite National Park | 🇺🇸 United States | |
| 19 | Olympic National Park | 🇺🇸 United States |
With luck
About 10% of wildlife watchers report a Western Conifer Seed Bug sighting in Sierra de Guadarrama National Park on a given day, based on 49 verified sightings from GBIF citizen-science data from 2019 to 2026. It is the 69th most-seen of the 597 insects we can rate there. Over three days the chance rises to about 30%, and over a week to about 50%, if each day is a fresh chance.
November
In that month about 30% of wildlife watchers report a Western Conifer Seed Bug in Sierra de Guadarrama National Park on a given day, against under 5% in May–June and December, the lowest months. That is one of Sierra de Guadarrama National Park's wettest months, with about 110 mm of rain against 20 mm in July.
Between 2 and 5 pm
Across all the parks we cover, that three-hour window holds the most Western Conifer Seed Bug sightings with a recorded time, and about 8 in 10 of them come between 6 am and 6 pm: it is a daytime animal.
9th of 19
Of the 19 parks where we can rate Western Conifer Seed Bug sightings, Sierra de Guadarrama National Park ranks 9th at about 10%. The best odds are in Cape Breton Highlands National Park (Canada, about 20%), Acadia National Park (United States, about 20%) and Cévennes National Park (France, about 20%).
Same family: Coreidae
The closest relatives of the Western Conifer Seed Bug that you can see in Sierra de Guadarrama National Park (family Coreidae, Leaf-footed Bugs) are Dock Bug (about 10%), Rhombic Leatherbug (about 10%) and Boat Bug (about 10%), with each one's daily chance of a sighting.
GBIF citizen-science records
It is estimated from how often the Western Conifer Seed Bug is recorded against all the insects logged in Sierra de Guadarrama National Park (49 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.
