Crotalus aquilus
In 3 days ~10% in a week ~30%
Crotalus aquilus, known as the Querétaro dusky rattlesnake or Queretaran dusky rattlesnake, is a pit viper species found in the highlands of central Mexico. Like all other pit vipers, it is venomous. No subspecies are currently recognized. The specific name, aquilus, is Latin for "eagle" and refers to the high altitude at which this species is found.
This species grows to a maximum reported total length of 67.8 cm (26.7 in), but most adult specimens, which have been described as heavy-bodied, are less than 50 cm (20 in) long. They are found in the highlands of central Mexico in Guanajuato, Hidalgo, México, Michoacán, and San Luis Potosí. The type locality given is "near Alvarez, San Luis Potosí, Mexico".
These snakes are found in the open grassy and generally rocky habitats north of the Trans-Mexican Volcanic Belt. They also occur in pine-oak forest, open karstic areas, grassy mountain meadows, and stony mesquite-grassland.
This species is classified as Least Concern on the IUCN Red List (v3.1, 2001). Species are listed as such due to their wide distribution, presumed large population, or because they... Wikipedia →
| # | Park | Country | Daily sighting probability |
|---|
More parks will be added in future updates.
| # | City | Country | Daily sighting probability |
|---|---|---|---|
| 1 | Mexico City | 🇲🇽 México |
| # | Zoo / Centre | Country | |
|---|---|---|---|
| 1 | Reino Animal | 🇲🇽 Mexico |
Rare
Under 5% of wildlife watchers report a Queretaran Dusky Rattlesnake sighting in Mexico City on a given day, based on 35 verified sightings from GBIF citizen-science data. It is the 19th most-seen of the 37 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 to September
In those months about 10% of wildlife watchers report a Queretaran Dusky Rattlesnake in Mexico City on a given day, against under 5% in October to April, the lowest months. Those are among Mexico City's wettest months, with about 130 mm of rain a month against 5 mm in December.
Only Mexico City, in our data
Mexico City is the only city on Wallace's Line with enough records to rate Queretaran Dusky Rattlesnake sightings: under 5% of wildlife watchers there report one on a given day.
Same genus: Crotalus
The closest relatives of the Queretaran Dusky Rattlesnake that you can see in Mexico City (genus Crotalus, Rattlesnakes) are Western Black-tailed Rattlesnake (about 10%) and Mexican Pygmy Rattlesnake (about 10%), with each one's daily chance of a sighting.
GBIF citizen-science records
It is estimated from how often the Queretaran Dusky Rattlesnake is recorded against all the reptiles logged in Mexico City (35 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.
