Gallerucida bifasciata
In 3 days ~10% in a week ~20%
| # | Park | Country | Daily sighting probability |
|---|---|---|---|
| 1 | Nikko National Park | 🇯🇵 Japan |
More parks will be added in future updates.
Rare
Under 5% of wildlife watchers report a Japanese Knotweed Leaf Beetle sighting in Tokyo on a given day, based on 27 verified sightings from GBIF citizen-science data. It is the 368th most-seen of the 1013 insects 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.
April
In that month about 10% of wildlife watchers report a Japanese Knotweed Leaf Beetle in Tokyo on a given day, against under 5% in May to March, the lowest months.
Between 11 am and 2 pm
Across all the parks we cover, that three-hour window holds the most Japanese Knotweed Leaf Beetle sightings with a recorded time, and about 8 in 10 of them come between 6 am and 6 pm: it is a daytime animal.
5th of 5
Of the 5 cities where we can rate Japanese Knotweed Leaf Beetle sightings, Tokyo ranks 5th at under 5%. The best odds are in Sendai (Japan, about 10%), Nanjing (China, about 10%) and Hangzhou (China, about 10%).
Same family: Chrysomelidae
The closest relatives of the Japanese Knotweed Leaf Beetle that you can see in Tokyo (family Chrysomelidae, Leaf Beetles) are Aulacophora nigripennis (about 20%), Lema diversipes (about 20%) and Nepalese Turtle Beetle (about 10%), with each one's daily chance of a sighting.
GBIF citizen-science records
It is estimated from how often the Japanese Knotweed Leaf Beetle is recorded against all the insects logged in Tokyo (27 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.
