Nerodia cyclopion
In 3 days ~20% in a week ~30%
The green water snake (Nerodia cyclopion) is a common species of nonvenomous natricine snake endemic to the southeastern United States. N. cyclopion is distributed from the Florida panhandle westward to Louisiana, and northward through the Mississippi Valley into southern Illinois.
More precisely, it is found in southwestern Alabama, southeastern Arkansas, northwestern Florida, southern Illinois, southwestern Indiana, western Kentucky, Louisiana, southern Mississippi, southeastern Missouri, western Tennessee, and southeastern Texas.
The type locality is New Orleans, Louisiana. N. cyclopion differs from most other species of North American water snakes by having one or more small scales under the eye, giving the appearance of a ring of small plates around the eye, a character shared with the species N. floridana.
A heavy-bodied snake, N. cyclopion is dark green, olive, or brown dorsally. Ventrally, it is yellowish on the anterior third, and the on remainder dark brown with yellow or white semicircles. N. cyclopion averages 76–140 cm (30-55 inches) in total length (including tail).
N. cyclopion is commonly known... Wikipedia →
| # | Park | Country | Daily sighting probability |
|---|
More parks will be added in future updates.
| # | City | Country | Daily sighting probability |
|---|---|---|---|
| 1 | Houston | 🇺🇸 United States |
With luck
About 10% of wildlife watchers report a Mississippi Green Watersnake sighting in Houston on a given day, based on 84 verified sightings from GBIF citizen-science data. It is the 22nd most-seen of the 30 reptiles we can rate there. Over three days the chance rises to about 20%, and over a week to about 30%, if each day is a fresh chance.
February to April
In those months about 10% of wildlife watchers report a Mississippi Green Watersnake in Houston on a given day, against under 5% in May to January, the lowest months.
Only Houston, in our data
Houston is the only city on Wallace's Line with enough records to rate Mississippi Green Watersnake sightings: about 10% of wildlife watchers there report one on a given day.
Same genus: Nerodia
The closest relatives of the Mississippi Green Watersnake that you can see in Houston (genus Nerodia, Watersnakes) are Banded Water Snake (about 20%), Plain-bellied Water Snake (about 10%) and Diamondback Watersnake (about 10%), with each one's daily chance of a sighting.
GBIF citizen-science records
It is estimated from how often the Mississippi Green Watersnake is recorded against all the reptiles logged in Houston (84 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.
