Drymobius margaritiferus
Silhouette: Alex Slavenko · PhyloPic
In 3 days ~30% in a week ~60%
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 Sian Ka'an Biosphere Reserve on a given day, based on 6 verified sightings from GBIF citizen-science data from 2019 to 2026. It is the 17th most-seen of the 23 reptiles we can rate there. Over three days the chance rises to about 30%, and over a week to about 60%, if each day is a fresh chance.
May
In that month about 30% of wildlife watchers report a Speckled Racer in Sian Ka'an Biosphere Reserve on a given day, against under 5% in March–April, August–September and November–January, the lowest months.
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.
3rd of 6
Of the 6 parks where we can rate Speckled Racer sightings, Sian Ka'an Biosphere Reserve ranks 3rd at about 10%. The best odds are in Calakmul Biosphere Reserve (Mexico, about 30%) and Santa Rosa National Park (Costa Rica, about 20%).
Same family: Colubridae
The closest relatives of the Speckled Racer that you can see in Sian Ka'an Biosphere Reserve (family Colubridae, Colubrid Snakes) are Mexican Parrot Snake (about 20%), Gulf Coast Vine Snake (about 10%) and Chicken Snake (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 Sian Ka'an Biosphere Reserve (6 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.
