Chrysops brunneus
In 3 days ~10% in a week ~20%
Chrysops brunneus is a species of deer fly in the family Tabanidae. It is found in the United States. Wikipedia →
| # | Park | Country | Daily sighting probability |
|---|---|---|---|
| 1 | Everglades National Park | 🇺🇸 United States |
More parks will be added in future updates.
| # | City | Country | Daily sighting probability |
|---|---|---|---|
| 1 | Toronto | 🇨🇦 Canada | |
| 2 | New York City | 🇺🇸 United States |
Rare
Under 5% of wildlife watchers report a Brownish Deer Fly sighting in Everglades National Park on a given day, based on 6 verified sightings from GBIF citizen-science data from 2019 to 2026. It is the 439th most-seen of the 496 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.
April–May and August
In those months about 10% of wildlife watchers report a Brownish Deer Fly in Everglades National Park on a given day, against under 5% in June–July and September–March, the lowest months.
Between 10 am and 1 pm
Across all the parks we cover, that three-hour window holds the most Brownish Deer Fly sightings with a recorded time, and nearly all of them come between 6 am and 6 pm: it is a daytime animal.
Only Everglades National Park, in our data
Everglades National Park is the only park on Wallace's Line with enough records to rate Brownish Deer Fly sightings: under 5% of wildlife watchers there report one on a given day.
Same family: Tabanidae
The closest relatives of the Brownish Deer Fly that you can see in Everglades National Park (family Tabanidae, Horse and Deer Flies) are Black Horse Fly (about 10%), Yellow Fly Of The Dismal Swamp (about 10%) and Green Horse Fly (about 10%), with each one's daily chance of a sighting.
GBIF citizen-science records
It is estimated from how often the Brownish Deer Fly is recorded against all the insects logged in Everglades National Park (6 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.
