Sciurus alleni
Silhouette: Ferran Sayol · PhyloPic
In 3 days ~70% in a week >90%
Allen's squirrel (Sciurus alleni) is a tree squirrel in the genus Sciurus endemic to northern Mexico. It has no recognised subspecies. Allen's squirrels are yellow-brown overall, grizzled with black and grey, with darker heads and lighter sides and legs. A white to buff ring surrounds the eye. The tail is black, sometimes touched with buff or yellow, and frosted white. Melanism is sometimes observed.
Females tend to have larger body mass than males. Outside of this, the species is not sexually dimorphic. The typical head and body length is 220–254 millimetres (8.7–10.0 in), with the tail comprising another 217–247 millimetres (8.5–9.7 in). Male body mass is typically 290–491 grains (0.66–1.12 oz), while female body mass it typically 345–510 grains (0.79–1.17 oz).
Allen's squirrel lives in northeastern Mexico. Its natural range covers southeastern Coahuila, central Nuevo León, and western Tamaulipas, extending south to the extreme north of San Luis Potosí. Allen's squirrel primarily inhabits oak and oak-pine montane forests. It has also been recorded in other mountain forest ecosystems, such as pecan forests in Tamaulipas and in pine-cedar... Wikipedia →
Recording0:10
Mexico · 2025
© paolamtz12 · iNaturalist · CC BY-NC 4.0
| # | Park | Country | Daily sighting probability |
|---|---|---|---|
| 1 | Cumbres de Monterrey National Park | 🇲🇽 Mexico |
More parks will be added in future updates.
| # | City | Country | Daily sighting probability |
|---|---|---|---|
| 1 | Monterrey | 🇲🇽 México |
Likely
About 40% of wildlife watchers report an Allen's Squirrel sighting in Monterrey on a given day, based on 406 verified sightings from GBIF citizen-science data. It is the most-seen of the 17 mammals we can rate there. Over three days the chance rises to about 70%, and over a week to over 90%, if each day is a fresh chance.
May and October–February
In those months about 40% of wildlife watchers report an Allen's Squirrel in Monterrey on a given day, against about 20% in June, the lowest month.
Between 9 am and noon
Across all the parks we cover, that three-hour window holds the most Allen's Squirrel sightings with a recorded time, and about 9 in 10 of them come between 6 am and 6 pm: it is a daytime animal.
Only Monterrey, in our data
Monterrey is the only city on Wallace's Line with enough records to rate Allen's Squirrel sightings: about 40% of wildlife watchers there report one on a given day.
GBIF citizen-science records
It is estimated from how often the Allen's Squirrel is recorded against all the mammals logged in Monterrey (406 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.
