Theretra nessus
In 3 days ~30% in a week ~50%
Theretra nessus, the yam hawk moth, is a moth of the family Sphingidae. It was described by Dru Drury in 1773. It is found in Sri Lanka, India (including the Andaman and Nicobar islands), Nepal, Myanmar, Thailand, Vietnam, southern China, Taiwan, South Korea, Japan, Philippines, Malaysia, Singapore, Indonesia, northern Australia, Guam and New Caledonia. It is a recent immigrant in Oahu.
The wingspan is 90–130 mm. Head, thorax and a stripe down center of abdomen is green suffused with ferrugineous. Thorax is with a lateral grey stripe and abdomen is golden yellow at the sides. Forewings are olive brown and the base with a patch of black and white on the inner margin. A black dot is present at end of cell. A postmedial waved oblique line met by three straight oblique lines from the apex at inner margin. Hindwings are black brown where the anal angle is ochreous, which colour extends towards the apex as a submarginal band. Ventral side is suffused with reddish ochreous.
Larva is bluish green, with a subdorsal line with oblique streaks below it on 4th to 10th somites. Ocellus on the 4th somite is greenish with a black ring. The horn is... Wikipedia →
| # | Park | Country | Daily sighting probability |
|---|---|---|---|
| 1 | Khao Yai National Park | 🇹🇭 Thailand | |
| 2 | Kanha National Park | 🇮🇳 India | |
| 3 | Daintree National Park | 🇦🇺 Australia | |
| 4 | Lamington National Park | 🇦🇺 Australia | |
| 5 | Springbrook National Park | 🇦🇺 Australia |
With luck
About 10% of wildlife watchers report a Yam Hawkmoth sighting in Nagoya on a given day, based on 6 verified sightings from GBIF citizen-science data. It is the 166th most-seen of the 195 insects 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.
July and September
In those months about 20% of wildlife watchers report a Yam Hawkmoth in Nagoya on a given day, against under 5% in October to June, the lowest months. Those are among Nagoya's wettest months, with about 220 mm of rain a month against 75 mm in January.
Between 9 pm and midnight
Across all the parks we cover, that three-hour window holds the most Yam Hawkmoth sightings with a recorded time, and about half of them come between 6 pm and 6 am: it is seen both by day and at night.
2nd of 14
Of the 14 cities where we can rate Yam Hawkmoth sightings, Nagoya ranks 2nd at about 10%. The best odds are in Hanoi (Vietnam, about 20%).
Same genus: Theretra
The closest relatives of the Yam Hawkmoth that you can see in Nagoya (genus Theretra, Hunter Hawkmoths) are White-Banded Hunter Hawkmoth (about 40%) and Theretra japonica (about 10%), with each one's daily chance of a sighting.
GBIF citizen-science records
It is estimated from how often the Yam Hawkmoth is recorded against all the insects logged in Nagoya (6 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.
