Tantilla gracilis
In 3 days ~10% in a week ~30%
Tantilla gracilis (flathead snake) is a species of snake of the family Colubridae. The snake is found in the US states of Missouri, Texas, Kansas, Illinois, Oklahoma, Louisiana and Arkansas and in Mexico. The flathead snake is a small snake with adults growing to 18–20 cm (7–8 in).
They feed on arthropods such as centipedes. Species Tantilla gracilis at The Reptile Database Flathead snake at the Illinois Natural History Survey Reptile and Amphibian Collection Wikipedia →
| # | Park | Country | Daily sighting probability |
|---|
More parks will be added in future updates.
| # | City | Country | Daily sighting probability |
|---|---|---|---|
| 1 | Austin | 🇺🇸 United States | |
| 2 | San Antonio | 🇺🇸 United States |
Rare
Under 5% of wildlife watchers report a Flat-headed Snake sighting in San Antonio on a given day, based on 22 verified sightings from GBIF citizen-science data. It is the 25th 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 30%, if each day is a fresh chance.
May, August and December
In those months about 10% of wildlife watchers report a Flat-headed Snake in San Antonio on a given day, against under 5% in January–April, June–July and September–November, the lowest months.
Between noon and 3 pm
Across all the parks we cover, that three-hour window holds the most Flat-headed Snake sightings with a recorded time, and about 8 in 10 of them come between 6 am and 6 pm: it is a daytime animal.
2nd of 2
Of the 2 cities where we can rate Flat-headed Snake sightings, San Antonio ranks 2nd at under 5%. The best odds are in Austin (United States, about 10%).
Same family: Colubridae
The closest relatives of the Flat-headed Snake that you can see in San Antonio (family Colubridae, Colubrid Snakes) are Diamondback Watersnake (about 20%), Western Rat Snake (about 10%) 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 Flat-headed Snake is recorded against all the reptiles logged in San Antonio (22 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.
