Bothrops ammodytoides
Silhouette: Steven Traver · PhyloPic
In 3 days ~90% in a week >90%
Common names: Patagonian lancehead, yarará ñata, Patagonian pit viper. Bothrops ammodytoides is a pit viper species endemic to Argentina. No subspecies are currently recognized. This species has a stocky build and grows to an average total length of 45–75 cm (18-30 inches), but is capable reaching almost 1 m (39 inches) in total length. The rostral scale is elongated vertically and the snout is upturned, similar to the hog-nosed pitvipers of the genus Porthidium.
Dorsally, it is pale brown, with a series of large squarish dark brown spots or crossbars which are edged with black. On some specimens these markings alternate to form a zigzag stripe. There is a dark streak behind the eye. Ventrally, it is yellowish with brown dots.
The very strongly keeled dorsal scales are arranged in 23 or 25 rows at midbody. Ventrals 149–160; anal plate entire; subcaudals 30–38, divided. The dorsal surface of the head is covered by small, imbricate, keeled scales. The large supraoculars are separated by 8 or 9 rows of these small scales. Two rows of scales separate the eye from the upper labials. Upper labials 9 or 10, the 2nd separated from the loreal pit, the 3rd and 4th largest. The... Wikipedia →
| # | Park | Country | Daily sighting probability |
|---|---|---|---|
| 1 | Península Valdés | 🇦🇷 Argentina |
More parks will be added in future updates.
No species of the same family or order lives in Península Valdés, so these are its closest relatives here: other reptiles.
Likely
About 50% of wildlife watchers report a Patagonia Lancehead sighting in Península Valdés on a given day, based on 33 verified sightings from GBIF citizen-science data from 2019 to 2026. It is the 2nd most-seen of the 6 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.
January and October–November
In those months about 60% of wildlife watchers report a Patagonia Lancehead in Península Valdés on a given day, against about 10% in July to September, the lowest months.
Between 3 and 6 pm
Across all the parks we cover, that three-hour window holds the most Patagonia Lancehead sightings with a recorded time, and about 7 in 10 of them come between 6 am and 6 pm: it is a daytime animal.
Only Península Valdés, in our data
Península Valdés is the only park on Wallace's Line with enough records to rate Patagonia Lancehead sightings: about 50% of wildlife watchers there report one on a given day.
GBIF citizen-science records
It is estimated from how often the Patagonia Lancehead is recorded against all the reptiles logged in Península Valdés (33 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.
