Regina grahamii
In 3 days ~10% in a week ~20%
Regina grahamii, commonly known as Graham's Crayfish Snake, is a species of nonvenomous semiaquatic snake in the subfamily Natricinae of the family Colubridae. The species is endemic to the central United States. The specific name, grahamii, is in honor of Lt. Col. James Duncan Graham, U.S. Topographical Engineers, who collected the type specimen.
Additional common names for R. grahamii include Graham's Crayfish Snake, Arkansas water snake, Graham's leather snake, Graham's queen snake, Graham's snake, Graham's water snake, prairie water adder, prairie water snake, and striped moccasin.
R. grahamii is a medium-sized snake, measuring an average of 18–28 inches (46–71 cm) in total length (including tail), but can grow up to almost 4 feet long in some cases. The maximum recorded total length is 47 inches (119 cm).
It is usually a brown or gray color with an occasional faint mid-dorsal stripe. Its lateral stripes are typically cream, white tan, or light yellow and located from the belly up to the fourth scale row. The belly is typically the same color as the lateral stripes and is unmarked, with the exception of a row of dark dots down... Wikipedia →
| # | Park | Country | Daily sighting probability |
|---|
More parks will be added in future updates.
Rare
Under 5% of wildlife watchers report a Graham's Crayfish Snake sighting in Houston on a given day, based on 8 verified sightings from GBIF citizen-science data. It is the 30th most-seen of the 30 reptiles we can rate there. Over three days the chance rises to about 10%, and over a week to about 20%, if each day is a fresh chance.
Any time of year
In every month with enough records, under 5% of wildlife watchers report a Graham's Crayfish Snake in Houston on a given day, so our monthly data shows no clear season.
Between 10 am and 1 pm
Across all the parks we cover, that three-hour window holds the most Graham's Crayfish Snake 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.
Among the best
Of the 2 cities where we can rate Graham's Crayfish Snake sightings, Houston ranks 2nd at under 5%, level with the leaders once rounded. The best odds are in Dallas (United States, under 5%).
Same family: Colubridae
The closest relatives of the Graham's Crayfish Snake that you can see in Houston (family Colubridae, Colubrid Snakes) are Banded Water Snake (about 20%), Western Ribbon Snake (about 20%) and Rough Earthsnake (about 10%), with each one's daily chance of a sighting.
GBIF citizen-science records
It is estimated from how often the Graham's Crayfish Snake is recorded against all the reptiles logged in Houston (8 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.
