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 Death Valley National Park on a given day, based on 5 verified sightings from GBIF citizen-science data from 2019 to 2026. It is the 91st most-seen of the 108 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.
July
In that month about 30% of wildlife watchers report a Giant Water Scavenger Beetle in Death Valley National Park on a given day, against under 5% in April, June and August–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.
Only Death Valley National Park, in our data
Death Valley National Park is the only park on Wallace's Line with enough records to rate Giant Water Scavenger Beetle sightings: about 10% of wildlife watchers there report one on a given day.
Same order: Coleoptera
The closest relatives of the Giant Water Scavenger Beetle that you can see in Death Valley National Park (order Coleoptera, Beetles) are Master Blister Beetle (about 40%), Ornate Checkered Beetle (about 40%) and Seven-Spotted Lady Beetle (about 30%), with each one's daily chance of a sighting.
GBIF citizen-science records
It is estimated from how often the Giant Water Scavenger Beetle is recorded against all the insects logged in Death Valley National Park (5 verified sightings from 2019 to 2026), 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.
