Pseudolycaena marsyas
In 3 days ~20% in a week ~40%
Pseudolycaena marsyas, the Cambridge blue, giant hairstreak or Marsyas hairstreak, is a species of butterfly in the family Lycaenidae. Wikipedia →
| # | Park | Country | Daily sighting probability |
|---|---|---|---|
| 1 | Main Ridge Forest Reserve | 🇹🇹 Trinidad and Tobago | |
| 2 | Serra dos Órgãos National Park | 🇧🇷 Brazil | |
| 3 | Iguazú National Park | 🇦🇷 Argentina | |
| 4 | Iguaçu National Park | 🇧🇷 Brazil |
| # | City | Country | Daily sighting probability |
|---|---|---|---|
| 1 | Porto Alegre | 🇧🇷 Brazil | |
| 2 | São Luís | 🇧🇷 Brazil | |
| 3 | Vitória | 🇧🇷 Brazil | |
| 4 | São Paulo | 🇧🇷 Brazil | |
| 5 | Lima | 🇵🇪 Peru | |
| 6 | Brasilia | 🇧🇷 Brazil | |
| 7 | Rio de Janeiro | 🇧🇷 Brazil |
With luck
About 10% of wildlife watchers report a Marsyas Hairstreak sighting in Iguaçu National Park on a given day, based on 9 verified sightings from GBIF citizen-science data from 2019 to 2026. It is the 179th 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.
April and May
In those months about 20% of wildlife watchers report a Marsyas Hairstreak in Iguaçu National Park on a given day, against under 5% in March and June–December, the lowest months.
Between 11 am and 2 pm
Across all the parks we cover, that three-hour window holds the most Marsyas 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 4 parks where we can rate Marsyas Hairstreak sightings, Iguaçu National Park ranks 4th at about 10%, level with the leaders once rounded. The best odds are in Main Ridge Forest Reserve (Trinidad and Tobago, about 10%), Serra dos Órgãos National Park (Brazil, about 10%) and Iguazú National Park (Argentina, about 10%).
Same family: Lycaenidae
The closest relatives of the Marsyas 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 Marsyas Hairstreak is recorded against all the insects logged in Iguaçu National Park (9 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.
