Heterodon platirhinos
Silhouette: Mason McNair · PhyloPic
In 3 days ~10% in a week ~20%
The eastern hog-nosed snake (Heterodon platirhinos) is a species of mildly venomous rear-fanged snake in the family Colubridae. The venom is specifically adapted to amphibian prey and is harmless to humans. However, some people may have an allergic reaction and as a result experience local swelling and other symptoms. The species is endemic to North America. There are no subspecies that are recognized as being valid. This species prefers habitats with sandy soils and a combination of grass fields and forest edges. It comes in many different colorations and has the identifiable upturned "snout." It can be found in captivity, but is a relatively difficult species to keep due to a specialized diet of toads. As with other Heterodon species, it has a distinctive threat reaction of first bluffing by striking with a closed mouth and then, if this fails to deter the threat, pretending to die.
Heterodon platirhinos has a wide geographical range from the central United States to the East Coast. In the northern parts of its range, it can be found in southern Ontario, southern New Hampshire, Minnesota, Wisconsin, and Massachusetts. Farther west, the snake can be found... Wikipedia →
Recording0:12
United States · 2025
© Pat_Treece · iNaturalist · CC BY-NC 4.0
Recording0:08
United States · 2024
© Oliver Yung · iNaturalist · CC BY-NC 4.0
| # | Park | Country | Daily sighting probability |
|---|---|---|---|
| 1 | Great Smoky Mountains National Park | 🇺🇸 United States |
More parks will be added in future updates.
| # | City | Country | Daily sighting probability |
|---|---|---|---|
| 1 | Houston | 🇺🇸 United States | |
| 2 | Austin | 🇺🇸 United States | |
| 3 | San Antonio | 🇺🇸 United States |
| # | Zoo / Centre | Country | |
|---|---|---|---|
| 1 | National Zoological Park | 🇺🇸 United States | |
| 2 | North Carolina Zoo | 🇺🇸 United States | |
| 3 | Rosamond Gifford Zoo | 🇺🇸 United States | |
| 4 | Turtle Back Zoo | 🇺🇸 United States | |
| 5 | Wonders of Wildlife Museum & Aquarium | 🇺🇸 United States | |
| 6 | Kentucky Reptile Zoo | 🇺🇸 United States |
Rare
Under 5% of wildlife watchers report an Eastern Hognose Snake sighting in San Antonio on a given day, based on 5 verified sightings from GBIF citizen-science data. It is the 31st 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.
Any time of year
In every month with enough records, under 5% of wildlife watchers report an Eastern Hognose Snake in San Antonio 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 Eastern Hognose Snake sightings with a recorded time, and about 9 in 10 of them come between 6 am and 6 pm: it is a daytime animal.
3rd of 3
Of the 3 cities where we can rate Eastern Hognose Snake sightings, San Antonio ranks 3rd at under 5%. The best odds are in Houston (United States, about 10%) and Austin (United States, about 10%).
Same family: Colubridae
The closest relatives of the Eastern Hognose 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 Eastern Hognose Snake is recorded against all the reptiles logged in San Antonio (5 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.
