Odorrana graminea
Silhouette: Michael Scroggie, from original photograph by John Bettaso, USFWS (original photograph in public domain). · PhyloPic
In 3 days ~30% in a week ~60%
Odorrana graminea, the large odorous frog, inhabits fast-flowing streams in elevated mountainous regions of Southern China and Northern Indochina. It is one of 56 species in the genus Odorrana. Male O. graminea are noted for their ultrasonic call characteristics and are one of three frog species able to detect ultrasonic frequencies (>20 kHz), likely evolved to facilitate communication amidst noisy streams and waterfalls. Studies on O. graminea courtship vocalizations suggest female preference for increased proportion of nonlinear vocal phenomena (NLP).
Odorrana graminea have a dorsoventrally compressed body with large eyes. Dorsum is green with smooth skin; flanks are brown with yellow marbling and with slight granulations. They are relatively large frogs, particularly the females: females grow to a snout–vent length of 78–100 mm (3.1–3.9 in), whereas males attain a more modest length of 42–53 mm (1.7–2.1 in). Apart from size, males differ from females by their smaller digital disks, stronger forearms, larger tympanum, velvety nuptial pads on thumb, and paired gular pouches below jaw articulations.
Odorrana graminea can produce ultrasonic calls. This is very rare... Wikipedia →
| # | Park | Country | Daily sighting probability |
|---|
More parks will be added in future updates.
| # | City | Country | Daily sighting probability |
|---|---|---|---|
| 1 | Hong Kong | 🇨🇳 China |
With luck
About 10% of wildlife watchers report a Large Odorous Frog sighting in Hong Kong on a given day, based on 99 verified sightings from GBIF citizen-science data. It is the 10th most-seen of the 16 amphibians 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.
March and July–September
In those months about 20% of wildlife watchers report a Large Odorous Frog in Hong Kong on a given day, against under 5% in February and December, the lowest months.
Between 7 and 10 pm
Across all the parks we cover, that three-hour window holds the most Large Odorous Frog sightings with a recorded time, and about 9 in 10 of them come between 6 pm and 6 am: it is mostly seen at night.
Only Hong Kong, in our data
Hong Kong is the only city on Wallace's Line with enough records to rate Large Odorous Frog sightings: about 10% of wildlife watchers there report one on a given day.
GBIF citizen-science records
It is estimated from how often the Large Odorous Frog is recorded against all the amphibians logged in Hong Kong (99 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.
