Elaphe climacophora
Silhouette: Alex Slavenko · PhyloPic
In 3 days ~30% in a week ~60%
The Japanese rat snake (Elaphe climacophora) is a medium-sized colubrid snake found throughout the Japanese archipelago (except the far South West) as well as on the Russian-administered Kunashir Island. In Japanese it is known as the aodaishō or "blue general". It is non-venomous and is hunted by eagles and tanukis.
The snakes brumate for three to four months, mate in spring and lay 7–20 eggs in early summer. Adults reach one to two meters in length and about five centimeters in girth. E. climacophora is the largest Japanese snake outside Okinawa. They are variable in color, ranging from pale yellow-green to dark blue-green. They can be identified as Asian rat snakes due to the dark streak behind each of their eyes.
Juveniles have brown-stripe pattern that may be mimesis of the venomous mamushi. There is an established, albino population in the wild, with specimens especially numerous near Iwakuni, where they are called "Iwakuni white snakes" and revered as messengers of deities and deity-guardians of mountains and rivers. The albino population was protected in 1924 as a "national monument."
Japanese rat snakes eat a variety of small animals: rodents... Wikipedia →
| # | Park | Country | Daily sighting probability |
|---|---|---|---|
| 1 | Nikko National Park | 🇯🇵 Japan |
More parks will be added in future updates.
| # | Zoo / Centre | Country | |
|---|---|---|---|
| 1 | San Diego Zoo | 🇺🇸 United States | |
| 2 | Fort Worth Zoo | 🇺🇸 United States | |
| 3 | Asahiyama Zoo | 🇯🇵 Japan | |
| 4 | Ueno Zoological Gardens (West Garden) | 🇯🇵 Japan | |
| 5 | Leningrad Zoo | 🇷🇺 Russia | |
| 6 | Siam Serpentarium | 🇹🇭 Thailand | |
| 7 | Snake Farm of Queen Saovabha Memorial Institute | 🇹🇭 Thailand | |
| 8 | Adachi Park of Living Things | 🇯🇵 Japan | |
| 9 | AOAO Sapporo | 🇯🇵 Japan | |
| 10 | Japan Snake Center | 🇯🇵 Japan | |
| 11 | Snake Discovery: A Reptile Experience | 🇺🇸 United States |
With luck
About 10% of wildlife watchers report a Japanese Rat Snake sighting in Osaka on a given day, based on 34 verified sightings from GBIF citizen-science data. It is the 7th most-seen of the 12 reptiles 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.
June
In that month about 30% of wildlife watchers report a Japanese Rat Snake in Osaka on a given day, against under 5% in December to March, the lowest months. That is one of Osaka's wettest months, with about 190 mm of rain against 55 mm in January.
Between 11 am and 2 pm
Across all the parks we cover, that three-hour window holds the most Japanese Rat 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.
5th of 5
Of the 5 cities where we can rate Japanese Rat Snake sightings, Osaka ranks 5th at about 10%. The best odds are in Nagoya (Japan, about 30%), Tokyo (Japan, about 20%) and Sendai (Japan, about 20%).
GBIF citizen-science records
It is estimated from how often the Japanese Rat Snake is recorded against all the reptiles logged in Osaka (34 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.
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