Chauliodes rastricornis
In 3 days ~20% in a week ~40%
Chauliodes rastricornis, the spring fishfly, is a species of fishfly in the family Corydalidae. It is found in North America. Wikipedia →
| # | Park | Country | Daily sighting probability |
|---|---|---|---|
| 1 | Point Pelee National Park | 🇨🇦 Canada | |
| 2 | Acadia National Park | 🇺🇸 United States | |
| 3 | Merritt Island National Wildlife Refuge | 🇺🇸 United States |
| # | City | Country | Daily sighting probability |
|---|---|---|---|
| 1 | Minneapolis [Saint Paul] | 🇺🇸 United States | |
| 2 | Detroit | 🇺🇸 United States | |
| 3 | Boston | 🇺🇸 United States | |
| 4 | Orlando | 🇺🇸 United States | |
| 5 | Houston | 🇺🇸 United States | |
| 6 | Chicago | 🇺🇸 United States | |
| 7 | Montreal | 🇨🇦 Canada | |
| 8 | New York City | 🇺🇸 United States | |
| 9 | Toronto | 🇨🇦 Canada | |
| 10 | Dallas | 🇺🇸 United States |
With luck
About 10% of wildlife watchers report a Spring Fishfly sighting in Acadia National Park on a given day, based on 11 verified sightings from GBIF citizen-science data from 2019 to 2026. It is the 187th most-seen of the 405 insects we can rate there. Over three days the chance rises to about 20%, and over a week to about 40%, if each day is a fresh chance.
April to July
In those months about 10% of wildlife watchers report a Spring Fishfly in Acadia National Park on a given day, against under 5% in August to March, the lowest months.
Between 9 pm and midnight
Across all the parks we cover, that three-hour window holds the most Spring Fishfly sightings with a recorded time, and about 6 in 10 of them come between 6 am and 6 pm: it is seen both by day and at night.
Among the best
Of the 3 parks where we can rate Spring Fishfly sightings, Acadia National Park ranks 2nd at about 10%, level with the leaders once rounded. The best odds are in Point Pelee National Park (Canada, about 10%).
GBIF citizen-science records
It is estimated from how often the Spring Fishfly is recorded against all the insects logged in Acadia National Park (11 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.
