Trimeresurus macrops
Silhouette: Steven Traver · PhyloPic
In 3 days ~60% in a week ~90%
Trimeresurus macrops is a venomous pit viper species endemic to Southeast Asia. No subspecies are currently recognized. Common names include large-eyed pitviper, green pit viper, and Kramer's pit viper. It can be distinguished from other green pit vipers by the relatively large size of its eyes, which is especially noticeable in adult specimens, and to which the specific name, macrops, refers.
According to Strine, Green pit vipers mate during the end of the rainy season, between September and October. Female vipers will pull male vipers up the tree and begin mating. It is found in Southeast Asia in northern Cambodia, Laos, Thailand, and southern Vietnam. The type locality given is "Bangkok, Thailand".
T. macrops belongs to the genus Trimeresurus, a group of Asian vipers with primarily hemotoxic venom — a type of venom that can destroy blood cells, disrupt blood clotting, and damage organ function. A bite from this viper's better-studied cousin, the white-lipped pit viper, is said to cause effects ranging from mild envenomation to death. The broader viper family, Viperidae, includes some of the deadliest snakes in the... Wikipedia →
| # | Park | Country | Daily sighting probability |
|---|---|---|---|
| 1 | Khao Yai National Park | 🇹🇭 Thailand |
More parks will be added in future updates.
| # | City | Country | Daily sighting probability |
|---|---|---|---|
| 1 | Bangkok | 🇹🇭 Thailand |
| # | Zoo / Centre | Country | |
|---|---|---|---|
| 1 | Snake Farm of Queen Saovabha Memorial Institute | 🇹🇭 Thailand |
Possible
About 30% of wildlife watchers report a Kramer's Pit Viper sighting in Bangkok on a given day, based on 486 verified sightings from GBIF citizen-science data. It is the 4th most-seen of the 35 reptiles we can rate there. Over three days the chance rises to about 60%, and over a week to about 90%, if each day is a fresh chance.
July and August
In those months about 40% of wildlife watchers report a Kramer's Pit Viper in Bangkok on a given day, against about 20% in November to April, the lowest months. Those are among Bangkok's wettest months, with about 180 mm of rain a month against 10 mm in December.
Between 2 and 5 pm
Across all the parks we cover, that three-hour window holds the most Kramer's Pit Viper sightings with a recorded time, and about 8 in 10 of them come between 6 am and 6 pm: it is a daytime animal.
Only Bangkok, in our data
Bangkok is the only city on Wallace's Line with enough records to rate Kramer's Pit Viper sightings: about 30% of wildlife watchers there report one on a given day.
GBIF citizen-science records
It is estimated from how often the Kramer's Pit Viper is recorded against all the reptiles logged in Bangkok (486 verified sightings), 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.
