Atractus crassicaudatus
Silhouette: Alex Slavenko · PhyloPic
In 3 days ~80% in a week >90%
The thickhead ground snake (Atractus crassicaudatus) is a nonvenomous colubrid snake species, with no recognized subspecies, endemic to central Colombia. The thickhead ground snake is dark purplish-brown or blackish both dorsally and ventrally, with small, yellowish spots dorsally, and larger ones ventrally. The first row of dorsal scales, next to the ventrals on each side, is yellowish. There is a yellowish blotch on each temple.
Its snout is obtuse. The rostral scale is small, the internasals are very small, and the prefrontals are as long as broad. The frontal is as long as or a little longer than broad, as long as its distance from the end of the snout, but much shorter than the parietals. The loreal scale is at least twice as long as it is high. Two postoculars are present; the temporals are 1+2. Seven upper labials (rarely six) occur, the third and fourth (or third) of which enter the orbit; the three lower labials contact the single pair of chin shields. The dorsal scales are smooth, in 17 rows. The ventrals are 146-161 in count. The anal scale is entire, with 19-27 paired subcaudal scales.
Adults may attain 42 centimetres (17 in) in total length. The length... Wikipedia →
| # | Park | Country | Daily sighting probability |
|---|
More parks will be added in future updates.
| # | City | Country | Daily sighting probability |
|---|---|---|---|
| 1 | Bogota | 🇨🇴 Colombia |
Likely
About 40% of wildlife watchers report a Thickhead Ground Snake sighting in Bogota on a given day, based on 573 verified sightings from GBIF citizen-science data. It is the most-seen of the 6 reptiles we can rate there. Over three days the chance rises to about 80%, and over a week to over 90%, if each day is a fresh chance.
February to August
In those months about 40% of wildlife watchers report a Thickhead Ground Snake in Bogota on a given day, against about 30% in September to January, the lowest months.
Between 9 am and noon
Across all the parks we cover, that three-hour window holds the most Thickhead Ground Snake sightings with a recorded time, and about 8 in 10 of them come between 6 am and 6 pm: it is a daytime animal.
Only Bogota, in our data
Bogota is the only city on Wallace's Line with enough records to rate Thickhead Ground Snake sightings: about 40% of wildlife watchers there report one on a given day.
GBIF citizen-science records
It is estimated from how often the Thickhead Ground Snake is recorded against all the reptiles logged in Bogota (573 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.
