Porthidium ophryomegas
Silhouette: Steven Traver · PhyloPic
In 3 days ~90% in a week >90%
Common names: slender hognosed pitviper, western hog-nosed viper. Porthidium ophryomegas is a venomous pitviper species found in Central America. No subspecies are currently recognized. Adults usually grow to a length of 40–60 cm (16–24 in) and have a relatively slender build. Females grow larger than males and are often more than 60 cm (24 in) in length, while males are usually about 45 cm (18 in). One exceptional specimen, a female, was reported to measure 77 cm (30 in).
The color pattern consists of a tan, brown, gray or grayish-brown ground color overlaid with a narrow white, yellow or rust brown vertebral stripe and 24–40 dark brown to almost black blotches that oppose or alternate across the vertebral line. The blotches have thin white borders that extend at roughly a right angle from the vertebral line.
Found in Central America in Guatemala, El Salvador, Honduras, Nicaragua and Costa Rica. The type locality given is "les terres chaudes du versant occidental de la Cordillère Escuintla (Guatémala)" (= warm regions on western slope of Cordillera, Escuintla, Guatemala).
Occurs in seasonally dry forests, including tropical dry... Wikipedia →
| # | Park | Country | Daily sighting probability |
|---|---|---|---|
| 1 | Santa Rosa National Park | 🇨🇷 Costa Rica | |
| 2 | Palo Verde National Park | 🇨🇷 Costa Rica |
| # | Zoo / Centre | Country | |
|---|---|---|---|
| 1 | La Paz Waterfall Gardens | 🇨🇷 Costa Rica | |
| 2 | Reptile Gardens | 🇺🇸 United States |
Likely
About 50% of wildlife watchers report a Slender Hognose Viper sighting in Santa Rosa National Park on a given day, based on 60 verified sightings from GBIF citizen-science data from 2019 to 2026. It is the 2nd most-seen of the 37 reptiles we can rate there. Over three days the chance rises to about 90%, and over a week to over 90%, if each day is a fresh chance.
June
In that month about 80% of wildlife watchers report a Slender Hognose Viper in Santa Rosa National Park on a given day, against about 40% in January, April, August and October, the lowest months. That is one of Santa Rosa National Park's wettest months, with about 330 mm of rain against almost none in February.
Between 6 and 9 pm
Across all the parks we cover, that three-hour window holds the most Slender Hognose Viper sightings with a recorded time, and about half of them come between 6 pm and 6 am: it is most active around dawn and dusk.
Yes
Of the 2 parks where we can rate Slender Hognose Viper sightings, Santa Rosa National Park has the highest daily chance: about 50%. Next come Palo Verde National Park (Costa Rica, about 20%).
GBIF citizen-science records
It is estimated from how often the Slender Hognose Viper is recorded against all the reptiles logged in Santa Rosa National Park (60 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.
