Porthidium nasutum
Silhouette: Steven Traver · PhyloPic
In 3 days ~50% in a week ~80%
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 Gandoca-Manzanillo Wildlife Refuge on a given day, based on 13 verified sightings from GBIF citizen-science data from 2019 to 2026. It is the 25th most-seen of the 33 reptiles we can rate there. Over three days the chance rises to about 50%, and over a week to about 80%, if each day is a fresh chance.
June
In that month about 40% of wildlife watchers report a Rainforest Hog-nosed Viper in Gandoca-Manzanillo Wildlife Refuge on a given day, against under 5% in May, July, September and November–December, 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.
4th of 7
Of the 7 parks where we can rate Rainforest Hog-nosed Viper sightings, Gandoca-Manzanillo Wildlife Refuge ranks 4th 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 Gandoca-Manzanillo Wildlife Refuge (family Viperidae, Vipers) are Fer-de-lance (about 20%) and Central American Bushmaster (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 Gandoca-Manzanillo 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.
