Eupeodes americanus
In 3 days ~10% in a week ~20%
Eupeodes americanus, the American hoverfly, is found throughout North America and inhabits meadows, and fields with flowers and foliage. Adults feed on nectar, whereas their larvae feed on aphids. The adult fly is black to metallic green, and has three yellow bands on its abdomen. Its face is a light yellow with large black compound eyes on either side, and its wings are clear; it is 9–12 mm in body length. The larvae are mature at around 11 mm, and they are yellow-white to salmon brown, with markings of black and white or yellow-white. The lighter markings consist of a transverse rectangular bars on segments 6 to 11, and a narrow line along each side of the larvae. Early instars have visible black setae. The larvae are active feeders. They are being considered as suitable biological control agents for aphids and scale insects. This species is considered highly migratory, moving from Canada to the southeastern United States during autumn Wikipedia →
| # | Park | Country | Daily sighting probability |
|---|
More parks will be added in future updates.
| # | City | Country | Daily sighting probability |
|---|---|---|---|
| 1 | Boston | 🇺🇸 United States | |
| 2 | Baltimore | 🇺🇸 United States | |
| 3 | Philadelphia | 🇺🇸 United States | |
| 4 | Washington | 🇺🇸 United States | |
| 5 | Toronto | 🇨🇦 Canada | |
| 6 | New York City | 🇺🇸 United States |
Rare
Under 5% of wildlife watchers report a Long-Tailed Aphideater sighting in Toronto on a given day, based on 16 verified sightings from GBIF citizen-science data. It is the 945th most-seen of the 1689 insects we can rate there. Over three days the chance rises to about 10%, and over a week to about 20%, if each day is a fresh chance.
Any time of year
In every month with enough records, under 5% of wildlife watchers report a Long-Tailed Aphideater in Toronto on a given day, so our monthly data shows no clear season.
Among the best
Of the 6 cities where we can rate Long-Tailed Aphideater sightings, Toronto ranks 5th at under 5%, level with the leaders once rounded. The best odds are in Boston (United States, under 5%), Baltimore (United States, under 5%) and Philadelphia (United States, under 5%).
GBIF citizen-science records
It is estimated from how often the Long-Tailed Aphideater is recorded against all the insects logged in Toronto (16 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.
