Lethe eurydice
In 3 days ~10% in a week ~20%
Lethe eurydice, the eyed brown or marsh eyed brown, is a species of Satyrinae butterfly that is native to North America. Wingspan: 38 to 48 mm. They have one brood with a flight period from late June through August. Larvae feed on sedges (Carex) in particular C. lacustris, C. atherodes, C. rostrata, and C. stricta. Wikipedia →
| # | Park | Country | Daily sighting probability |
|---|---|---|---|
| 1 | Congaree National Park | 🇺🇸 United States | |
| 2 | Acadia National Park | 🇺🇸 United States | |
| 3 | Great Smoky Mountains National Park | 🇺🇸 United States |
| # | City | Country | Daily sighting probability |
|---|---|---|---|
| 1 | Washington | 🇺🇸 United States | |
| 2 | Chicago | 🇺🇸 United States | |
| 3 | Toronto | 🇨🇦 Canada | |
| 4 | New York City | 🇺🇸 United States | |
| 5 | Montreal | 🇨🇦 Canada | |
| 6 | Boston | 🇺🇸 United States |
Rare
Under 5% of wildlife watchers report an Eyed Brown sighting in Chicago on a given day, based on 32 verified sightings from GBIF citizen-science data. It is the 354th most-seen of the 978 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.
July
In that month about 10% of wildlife watchers report an Eyed Brown in Chicago on a given day, against under 5% in August to June, the lowest months.
Between 10 am and 1 pm
Across all the parks we cover, that three-hour window holds the most Eyed Brown sightings with a recorded time, and nearly all of them come between 6 am and 6 pm: it is a daytime animal.
Among the best
Of the 6 cities where we can rate Eyed Brown sightings, Chicago ranks 2nd at under 5%, level with the leaders once rounded. The best odds are in Washington (United States, under 5%).
GBIF citizen-science records
It is estimated from how often the Eyed Brown is recorded against all the insects logged in Chicago (32 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.
