Eupeodes fumipennis
In 3 days ~10% in a week ~30%
Eupeodes fumipennis, the western aphideater, is a species of hover fly in the family Syrphidae. As the common name implies, larvae prey on plant-sucking insects, primarily aphids. Like other members of the family, adults often hover over the plants they visit. Wikipedia →
| # | Park | Country | Daily sighting probability |
|---|---|---|---|
| 1 | Channel Islands National Park | 🇺🇸 United States | |
| 2 | Great Bear Rainforest | 🇨🇦 Canada | |
| 3 | Banff National Park | 🇨🇦 Canada | |
| 4 | Joshua Tree National Park | 🇺🇸 United States | |
| 5 | Yosemite National Park | 🇺🇸 United States | |
| 6 | Olympic National Park | 🇺🇸 United States |
| # | City | Country | Daily sighting probability |
|---|---|---|---|
| 1 | Sacramento | 🇺🇸 United States | |
| 2 | Portland | 🇺🇸 United States | |
| 3 | Vancouver | 🇨🇦 Canada | |
| 4 | Seattle | 🇺🇸 United States | |
| 5 | San Francisco | 🇺🇸 United States | |
| 6 | Los Angeles | 🇺🇸 United States | |
| 7 | San Diego | 🇺🇸 United States | |
| 8 | Calgary | 🇨🇦 Canada | |
| 9 | Salt Lake City | 🇺🇸 United States | |
| 10 | Phoenix | 🇺🇸 United States |
Rare
Under 5% of wildlife watchers report a Western Aphideater sighting in Yosemite National Park on a given day, based on 9 verified sightings from GBIF citizen-science data from 2019 to 2026. It is the 159th most-seen of the 227 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.
June and September–October
In those months about 10% of wildlife watchers report a Western Aphideater in Yosemite National Park on a given day, against under 5% in July–August and November–May, the lowest months. Those are among Yosemite National Park's driest months, with about 30 mm of rain a month against 220 mm in January.
Between 10 am and 1 pm
Across all the parks we cover, that three-hour window holds the most Western Aphideater sightings with a recorded time, and nearly all of them come between 6 am and 6 pm: it is a daytime animal.
5th of 6
Of the 6 parks where we can rate Western Aphideater sightings, Yosemite National Park ranks 5th at under 5%. The best odds are in Channel Islands National Park (United States, about 10%), Great Bear Rainforest (Canada, about 10%) and Banff National Park (Canada, about 10%).
GBIF citizen-science records
It is estimated from how often the Western Aphideater is recorded against all the insects logged in Yosemite National Park (9 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.
