Ocaria ocrisia
In 3 days ~20% in a week ~40%
Ocaria ocrisia, the black hairstreak or Hewitson's blackstreak, is a butterfly of the family Lycaenidae. It was described by William Chapman Hewitson in 1868. It is found from Mexico to Brazil, Paraguay, Peru, Ecuador and Argentina. It has also been recorded in southern Arizona. The habitat consists of rainforests at altitudes ranging from 200 to 900 meters.
The wingspan is about 27 mm. Insecta. Lepidoptera-Rhopalocera. Vol. 2. p. 49Pl. 54, Figs. 5, 6. {{cite book}}: External link in |postscript= (help)CS1 maint: postscript (link) Hewitson, William C. (1869). "Thecla Ocrisia Hewitson". Illustrations of Diurnal Lepidoptera: Lycænidæ. Vol. 1. London: Taylor and Francis. pp. 123–124Pl. 48, Figs. 235, 236. {{cite book}}: External link in |postscript= (help)CS1 maint: postscript (link)
Pelham, Jonathan P. (2008). "A Catalogue of the Butterflies of the United States and Canada". Journal of Research on the Lepidoptera. 40: 212. doi:10.5962/p.332201. S2CID 248737151. Wikipedia →
| # | Park | Country | Daily sighting probability |
|---|---|---|---|
| 1 | Iguazú National Park | 🇦🇷 Argentina | |
| 2 | Iguaçu National Park | 🇧🇷 Brazil |
With luck
About 10% of wildlife watchers report a Black Hairstreak sighting in Iguaçu National Park on a given day, based on 7 verified sightings from GBIF citizen-science data from 2019 to 2026. It is the 195th most-seen of the 279 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.
October and December–March
In those months about 10% of wildlife watchers report a Black Hairstreak in Iguaçu National Park on a given day, against under 5% in April–September and November, the lowest months.
Between 11 am and 2 pm
Across all the parks we cover, that three-hour window holds the most Black Hairstreak 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 2 parks where we can rate Black Hairstreak sightings, Iguaçu National Park ranks 2nd at about 10%, level with the leaders once rounded. The best odds are in Iguazú National Park (Argentina, about 10%).
Same family: Lycaenidae
The closest relatives of the Black Hairstreak that you can see in Iguaçu National Park (family Lycaenidae, Gossamer-winged Butterflies) are Separated Stripestreak (about 20%), Great Emesis (about 10%) and Cassius Blue (about 10%), with each one's daily chance of a sighting.
GBIF citizen-science records
It is estimated from how often the Black Hairstreak is recorded against all the insects logged in Iguaçu National Park (7 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.
