Drymobius margaritiferus
Silhouette: Alex Slavenko · PhyloPic
In 3 days ~30% in a week ~50%
Drymobius margaritiferus, commonly known as the speckled racer, is a species of nonvenomous colubrid snake native to the Americas. The specific name, margaritiferus, means "pearl-bearing" in Latin, referring to the pearl-like spots on the dorsal scales.
This species ranges throughout Central America from the Isthmus of Tehuantepec and Yucatán Peninsula, southward to Panama and adjacent areas of northwest Colombia, occurring at elevations from sea level up to 4,750 feet (1,453 m). Northward, it is found in the coastal lowlands and lower exterior slopes of the Sierra Madres of Mexico, up the west coast to Sonora, and up the east coast to northern Tamaulipas. The northern limit of its distribution ranges into extreme south Texas, USA, where it is uncommon to rare in a few of the southernmost counties of the state.
Speckled racers occur in a wide variety of habitats, including: forest, forest edges and clearings, secondary growth, riparian zones, savannahs, marshlands, pastures, and roadsides. It is often said to favor humid and wet areas with permanent water sources. However, these snakes have been found in areas where no water was apparent, and habitats... Wikipedia →
| # | Park | Country | Daily sighting probability |
|---|---|---|---|
| 1 | Calakmul Biosphere Reserve | 🇲🇽 Mexico | |
| 2 | Santa Rosa National Park | 🇨🇷 Costa Rica | |
| 3 | Sian Ka'an Biosphere Reserve | 🇲🇽 Mexico | |
| 4 | Cumbres de Monterrey National Park | 🇲🇽 Mexico | |
| 5 | La Amistad International Park (Panama) | 🇵🇦 Panama | |
| 6 | Arenal Volcano National Park | 🇨🇷 Costa Rica |
| # | City | Country | Daily sighting probability |
|---|---|---|---|
| 1 | San Pedro Sula | 🇭🇳 Honduras |
With luck
About 10% of wildlife watchers report a Speckled Racer sighting in Cumbres de Monterrey National Park on a given day, based on 28 verified sightings from GBIF citizen-science data from 2019 to 2026. It is the 16th most-seen of the 43 reptiles we can rate there. Over three days the chance rises to about 30%, and over a week to about 50%, if each day is a fresh chance.
August and December
In those months about 20% of wildlife watchers report a Speckled Racer in Cumbres de Monterrey National Park on a given day, against under 5% in January–February and November, the lowest months. Those are among Cumbres de Monterrey National Park's driest months, with about 55 mm of rain a month against 180 mm in September.
Between 8 and 11 am
Across all the parks we cover, that three-hour window holds the most Speckled Racer sightings with a recorded time, and about 9 in 10 of them come between 6 am and 6 pm: it is a daytime animal.
4th of 6
Of the 6 parks where we can rate Speckled Racer sightings, Cumbres de Monterrey National Park ranks 4th at about 10%. The best odds are in Calakmul Biosphere Reserve (Mexico, about 30%), Santa Rosa National Park (Costa Rica, about 20%) and Sian Ka'an Biosphere Reserve (Mexico, about 10%).
Same family: Colubridae
The closest relatives of the Speckled Racer that you can see in Cumbres de Monterrey National Park (family Colubridae, Colubrid Snakes) are Northern Cat-eyed Snake (about 10%), Baird's Ratsnake (about 10%) and Great Plains Ratsnake (about 10%), with each one's daily chance of a sighting.
GBIF citizen-science records
It is estimated from how often the Speckled Racer is recorded against all the reptiles logged in Cumbres de Monterrey National Park (28 verified sightings from 2019 to 2026), 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.
