Porthidium nasutum
Silhouette: Steven Traver · PhyloPic
In 3 days ~40% in a week ~70%
Common names: hognosed pit viper, hognosed pit viper, rainforest hognosed pit viper, horned hog-nosed viper. Porthidium nasutum is a pit viper species native to southern Mexico, Central America and northern South America. No subspecies are recognized as being valid.
Adults of Porthidium nasutum are usually less than 40 centimetres (16 in) in total length (tail included), and rarely more than 60 centimetres (24 in). Females are considerably larger than males. Both sexes are moderately stout.
Porthidium nasutum is found in southern Mexico southward through Central America to western Colombia and northwestern Ecuador in South America. Inhabits the Atlantic lowlands from Mexico (Tabasco and Chiapas) through Belize, Guatemala, Honduras, Nicaragua and Costa Rica to eastern Panama and northwestern Colombia. In the Pacific lowlands, it occurs in southwestern Costa Rica, central and eastern Panama, continuing on to northwestern Ecuador. The type locality given is "Pansos [Panzós], sur les bords du Polochic [Alta Verapaz] (Guatémala)".
The preferred natural habitat of Porthidium nasutum is mesic lowland broadleaf or rainforest from... Wikipedia →
| # | Park | Country | Daily sighting probability |
|---|---|---|---|
| 1 | Pico Bonito National Park | 🇭🇳 Honduras | |
| 2 | Tenorio Volcano National Park | 🇨🇷 Costa Rica | |
| 3 | Darién National Park | 🇵🇦 Panama | |
| 4 | Gandoca-Manzanillo Wildlife Refuge | 🇨🇷 Costa Rica | |
| 5 | Arenal Volcano National Park | 🇨🇷 Costa Rica | |
| 6 | Cahuita National Park | 🇨🇷 Costa Rica | |
| 7 | Braulio Carrillo National Park | 🇨🇷 Costa Rica |
| # | Zoo / Centre | Country | |
|---|---|---|---|
| 1 | La Paz Waterfall Gardens | 🇨🇷 Costa Rica |
Possible
About 20% of wildlife watchers report a Rainforest Hog-nosed Viper sighting in Arenal Volcano National Park on a given day, based on 48 verified sightings from GBIF citizen-science data from 2019 to 2026. It is the 18th most-seen of the 64 reptiles we can rate there. Over three days the chance rises to about 40%, and over a week to about 70%, if each day is a fresh chance.
July
In that month about 30% of wildlife watchers report a Rainforest Hog-nosed Viper in Arenal Volcano National Park on a given day, against about 10% in March–April, September and November–January, the lowest months.
Between 9 am and noon
Across all the parks we cover, that three-hour window holds the most Rainforest Hog-nosed Viper sightings with a recorded time, and about 7 in 10 of them come between 6 am and 6 pm: it is seen both by day and at night.
5th of 7
Of the 7 parks where we can rate Rainforest Hog-nosed Viper sightings, Arenal Volcano National Park ranks 5th at about 20%. The best odds are in Pico Bonito National Park (Honduras, about 40%), Tenorio Volcano National Park (Costa Rica, about 30%) and Darién National Park (Panama, about 20%).
Same family: Viperidae
The closest relatives of the Rainforest Hog-nosed Viper that you can see in Arenal Volcano National Park (family Viperidae, Vipers) are Fer-de-lance (about 40%), Central American Jumping Pit Viper (about 20%) and Side-striped palm pit viper (about 10%), with each one's daily chance of a sighting.
GBIF citizen-science records
It is estimated from how often the Rainforest Hog-nosed Viper is recorded against all the reptiles logged in Arenal Volcano National Park (48 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.
