Hydrophilus triangularis
In 3 days ~10% in a week ~20%
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 |
Rare
Under 5% of wildlife watchers report a Giant Water Scavenger Beetle sighting in San Antonio on a given day, based on 6 verified sightings from GBIF citizen-science data. It is the 581st most-seen of the 697 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.
Any time of year
In every month with enough records, under 5% of wildlife watchers report a Giant Water Scavenger Beetle in San Antonio on a given day, so our monthly data shows no clear season.
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.
8th of 10
Of the 10 cities where we can rate Giant Water Scavenger Beetle sightings, San Antonio ranks 8th at under 5%. The best odds are in Sacramento (United States, about 10%), Salt Lake City (United States, under 5%) and Austin (United States, under 5%).
Same order: Coleoptera
The closest relatives of the Giant Water Scavenger Beetle that you can see in San Antonio (order Coleoptera, Beetles) are Asian Lady Beetle (about 30%), Seven-Spotted Lady Beetle (about 10%) and Dark Flower Scarab (about 10%), 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 San Antonio (6 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.
