Hydrophilus triangularis
In 3 days ~20% in a week ~40%
Hydrophilus triangularis, known generally as the giant black water beetle or giant water scavenger, is a species of water scavenger beetle in the family Hydrophilidae. It is the most common and widespread species of Hydrophilus in North America, being found across the contiguous United States, southern Canada, and Mexico. Wikipedia →
| # | Park | Country | Daily sighting probability |
|---|---|---|---|
| 1 | Death Valley National Park | 🇺🇸 United States |
More parks will be added in future updates.
| # | City | Country | Daily sighting probability |
|---|---|---|---|
| 1 | Sacramento | 🇺🇸 United States | |
| 2 | Salt Lake City | 🇺🇸 United States | |
| 3 | Austin | 🇺🇸 United States | |
| 4 | San Francisco | 🇺🇸 United States | |
| 5 | Houston | 🇺🇸 United States | |
| 6 | Dallas | 🇺🇸 United States | |
| 7 | Chicago | 🇺🇸 United States | |
| 8 | San Antonio | 🇺🇸 United States | |
| 9 | Toronto | 🇨🇦 Canada | |
| 10 | New York City | 🇺🇸 United States |
With luck
About 10% of wildlife watchers report a Giant Water Scavenger Beetle sighting in Sacramento on a given day, based on 35 verified sightings from GBIF citizen-science data. It is the 131st most-seen of the 386 insects we can rate there. Over three days the chance rises to about 20%, and over a week to about 40%, if each day is a fresh chance.
March–April and August–October
In those months about 10% of wildlife watchers report a Giant Water Scavenger Beetle in Sacramento on a given day, against under 5% in May–July and November–February, the lowest months.
Between midnight and 3 am
Across all the parks we cover, that three-hour window holds the most Giant Water Scavenger Beetle sightings with a recorded time, and about 6 in 10 of them come between 6 am and 6 pm: it is seen both by day and at night.
Yes
Of the 10 cities where we can rate Giant Water Scavenger Beetle sightings, Sacramento has the highest daily chance: about 10%. Next come Salt Lake City (United States, under 5%) and Austin (United States, under 5%).
GBIF citizen-science records
It is estimated from how often the Giant Water Scavenger Beetle is recorded against all the insects logged in Sacramento (35 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.
