Fixsenia favonius
In 3 days ~20% in a week ~40%
Satyrium favonius, the oak hairstreak or southern hairstreak, is a butterfly of the family Lycaenidae. It is found in the United States from southern New England and the Atlantic Coast south to peninsular Florida and west to central Illinois, south-eastern Colorado and the Gulf Coast.
The wingspan is 22–38 mm. The larvae feed on the leaves, buds and male catkins of Quercus species. The species overwinters as an egg. Wikipedia →
| # | Park | Country | Daily sighting probability |
|---|---|---|---|
| 1 | Merritt Island National Wildlife Refuge | 🇺🇸 United States |
More parks will be added in future updates.
| # | City | Country | Daily sighting probability |
|---|---|---|---|
| 1 | Austin | 🇺🇸 United States | |
| 2 | Miami | 🇺🇸 United States | |
| 3 | San Antonio | 🇺🇸 United States |
With luck
About 10% of wildlife watchers report an Oak Hairstreak sighting in Merritt Island National Wildlife Refuge on a given day, based on 13 verified sightings from GBIF citizen-science data from 2019 to 2026. It is the 90th most-seen of the 189 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
In that month about 30% of wildlife watchers report an Oak Hairstreak in Merritt Island National Wildlife Refuge on a given day, against under 5% in June to March, the lowest months.
Between 10 am and 1 pm
Across all the parks we cover, that three-hour window holds the most Oak Hairstreak sightings with a recorded time, and nearly all of them come between 6 am and 6 pm: it is a daytime animal.
Only Merritt Island National Wildlife Refuge, in our data
Merritt Island National Wildlife Refuge is the only park on Wallace's Line with enough records to rate Oak Hairstreak sightings: about 10% of wildlife watchers there report one on a given day.
Same family: Lycaenidae
The closest relatives of the Oak Hairstreak that you can see in Merritt Island National Wildlife Refuge (family Lycaenidae, Gossamer-winged Butterflies) are Ceraunus Blue (about 30%), Atala (about 20%) and Eastern Pygmy-Blue (about 10%), with each one's daily chance of a sighting.
GBIF citizen-science records
It is estimated from how often the Oak Hairstreak is recorded against all the insects logged in Merritt Island National Wildlife Refuge (13 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.
