Dendrelaphis haasi
Silhouette: Alex Slavenko · PhyloPic
In 3 days ~10% in a week ~20%
Dendrelaphis haasi, also known commonly as Haas' bronzeback, Haas's bronzeback, Haas's bronzeback snake, and Haas's bronzeback tree snake, is a species of snake in the family Colubridae. The species is native to Southeast Asia.
The specific name, haasi, is in honor of Dutch herpetologist C.P.J. de Haas. Dendrelaphis haasi belongs to the genus Dendrelaphis, which contains 48 other described species. Dendrelaphis is one of five genera belonging to the vine snake subfamily Ahaetuliinae, of which Dendrelaphis is most closely related to Chrysopelea, as shown in the cladogram below:
D. haasi is found in Bangladesh, Brunei, Indonesia, Malaysia, and Singapore. The preferred natural habitat of D. haasi is forest, at altitudes near to sea level, but it has also been found in gardens. D. haasi is slender and has a very long tail, which is 34% to 38% of its total length. The holotype has a snout-to-vent length of 57.5 cm (22.6 in), plus a tail length of 33 cm (13 in).
D. haasi is diurnal and fully arboreal. D. haasi preys upon frogs and lizards. D. haasi is oviparous... Wikipedia →
| # | Park | Country | Daily sighting probability |
|---|
More parks will be added in future updates.
| # | City | Country | Daily sighting probability |
|---|---|---|---|
| 1 | Singapore | 🇸🇬 Singapore |
Rare
Under 5% of wildlife watchers report a Haas's Bronzeback Snake sighting in Singapore on a given day, based on 11 verified sightings from GBIF citizen-science data. It is the 55th most-seen of the 64 reptiles we can rate there. Over three days the chance rises to about 10%, and over a week to about 20%, if each day is a fresh chance.
Any time of year
In every month with enough records, under 5% of wildlife watchers report a Haas's Bronzeback Snake in Singapore on a given day, so our monthly data shows no clear season.
Only Singapore, in our data
Singapore is the only city on Wallace's Line with enough records to rate Haas's Bronzeback Snake sightings: under 5% of wildlife watchers there report one on a given day.
Same genus: Dendrelaphis
The closest relatives of the Haas's Bronzeback Snake that you can see in Singapore (genus Dendrelaphis, Bronzebacks) are Common Bronze-back (about 20%), Kopstein's Bronzeback Snake (about 10%) and Gray Bronzeback (about 10%), with each one's daily chance of a sighting.
GBIF citizen-science records
It is estimated from how often the Haas's Bronzeback Snake is recorded against all the reptiles logged in Singapore (11 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.
