Ranatra fusca
In 3 days ~10% in a week ~20%
Ranatra fusca is a water stick-insect in the family Nepidae, native to North America. It is known by the common name brown water scorpion. It is generally 3.2–4.2 cm (1.3–1.7 in) long. They are carnivorous and feed on other insects and crustaceans. They are most common from spring to autumn. Wikipedia →
| # | Park | Country | Daily sighting probability |
|---|---|---|---|
| 1 | Great Bear Rainforest | 🇨🇦 Canada |
More parks will be added in future updates.
| # | City | Country | Daily sighting probability |
|---|---|---|---|
| 1 | Minneapolis [Saint Paul] | 🇺🇸 United States | |
| 2 | Vancouver | 🇨🇦 Canada | |
| 3 | Edmonton | 🇨🇦 Canada | |
| 4 | Chicago | 🇺🇸 United States |
Rare
Under 5% of wildlife watchers report a Brown Waterscorpion sighting in Vancouver on a given day, based on 23 verified sightings from GBIF citizen-science data. It is the 208th most-seen of the 482 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.
November
In that month about 10% of wildlife watchers report a Brown Waterscorpion in Vancouver on a given day, against under 5% in December to October, the lowest months. That is one of Vancouver's wettest months, with about 210 mm of rain against 25 mm in July.
Between 4 and 7 pm
Across all the parks we cover, that three-hour window holds the most Brown Waterscorpion sightings with a recorded time, and about 8 in 10 of them come between 6 am and 6 pm: it is a daytime animal.
Among the best
Of the 4 cities where we can rate Brown Waterscorpion sightings, Vancouver ranks 2nd at under 5%, level with the leaders once rounded. The best odds are in Minneapolis [Saint Paul] (United States, under 5%).
Same order: Hemiptera
The closest relatives of the Brown Waterscorpion that you can see in Vancouver (order Hemiptera, True Bugs, Hoppers, Aphids, and allies) are Brown Marmorated Stink Bug (about 20%), Western Conifer Seed Bug (about 20%) and Bright-Spotted Groundbug (about 10%), with each one's daily chance of a sighting.
GBIF citizen-science records
It is estimated from how often the Brown Waterscorpion is recorded against all the insects logged in Vancouver (23 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.
