Patagonian Lancehead
Bothrops ammodytoides
A small pit viper found further south than any other pitviper in the world, inhabiting the cold steppes of Patagonia.
- Venomous?
- Venomous
- Adult length
- 0.5-0.8 m (1.6-2.6 ft)
- Range
- Southern Argentina, including Patagonia
Found a snake like this?
Identify any snake from a photo, free.
Overview
The Patagonian Lancehead holds the distinction of being the southernmost-occurring pit viper on Earth, surviving in the cool, arid steppe environments of southern Argentina far outside the tropical range typical of its lancehead relatives.
Its small size and cryptic coloration allow it to blend into the sparse, rocky scrubland it calls home, where it hunts small vertebrates adapted to the region's harsh climate.
How to identify it
- Grayish-brown to olive base color with a series of darker dorsal blotches
- Relatively short, stout body compared to tropical Bothrops species
- Triangular head distinct from the neck, typical of pit vipers
- Vertically elliptical pupils
- Heat-sensing pits between eye and nostril
- Distinguished from other South American lanceheads by its smaller size and more southerly range
Habitat & range
Found in arid steppe, scrubland, and semi-desert habitats of Patagonia, often at higher elevations and in colder climates than related species. Its range extends into some of the coldest environments tolerated by any pit viper.
Behavior, diet & reproduction
Active mainly during warmer daylight hours given the cool climate it inhabits. Feeds on small rodents and lizards. Ovoviviparous, giving birth to live young, an adaptation well-suited to its cold habitat.
Frequently asked questions
Is the Patagonian Lancehead venomous?
Yes, it is a venomous pit viper, though it is small and generally not aggressive.
Where does it live?
In the cold, arid steppes of southern Argentina, the southernmost range of any pit viper species.
How big does it get?
It is a relatively small species, typically reaching 0.5-0.8 m (1.6-2.6 ft).
What does it eat?
Small rodents and lizards adapted to the Patagonian steppe.
Patagonian Lancehead guides
In-depth guides for identifying and understanding Patagonian Lancehead.
