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 |
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More parks will be added in future updates.
Rare
Under 5% of wildlife watchers report a Graham's Crayfish Snake sighting in Dallas on a given day, based on 10 verified sightings from GBIF citizen-science data. It is the 29th most-seen of the 33 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.
March
In that month about 10% of wildlife watchers report a Graham's Crayfish Snake in Dallas on a given day, against under 5% in April to February, the lowest months.
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.
Yes
Of the 2 cities where we can rate Graham's Crayfish Snake sightings, Dallas has the highest daily chance: under 5%. Next come Houston (United States, under 5%).
Same family: Colubridae
The closest relatives of the Graham's Crayfish Snake that you can see in Dallas (family Colubridae, Colubrid Snakes) are Rough Earthsnake (about 20%), Plain-bellied Water Snake (about 20%) 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 Graham's Crayfish Snake is recorded against all the reptiles logged in Dallas (10 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.
