Ambrysus mormon
In 3 days ~10% in a week ~30%
Ambrysus mormon, the creeping water bug, is a species of creeping water bug in the family Naucoridae. It is found in the western United States and northwestern Mexico. Wikipedia →
| # | Park | Country | Daily sighting probability |
|---|---|---|---|
| 1 | Yellowstone National Park | 🇺🇸 United States |
More parks will be added in future updates.
Rare
Under 5% of wildlife watchers report an Ambrysus mormon sighting in Yellowstone National Park on a given day, based on 9 verified sightings from GBIF citizen-science data from 2019 to 2026. It is the 102nd most-seen of the 160 insects we can rate there. Over three days the chance rises to about 10%, and over a week to about 30%, if each day is a fresh chance.
October
In that month about 20% of wildlife watchers report an Ambrysus mormon in Yellowstone National Park on a given day, against under 5% in July–August and November–May, the lowest months.
Between 11 am and 2 pm
Across all the parks we cover, that three-hour window holds the most Ambrysus mormon sightings with a recorded time, and about 9 in 10 of them come between 6 am and 6 pm: it is a daytime animal.
Only Yellowstone National Park, in our data
Yellowstone National Park is the only park on Wallace's Line with enough records to rate Ambrysus mormon sightings: under 5% of wildlife watchers there report one on a given day.
Same order: Hemiptera
The closest relatives of the Ambrysus mormon that you can see in Yellowstone National Park (order Hemiptera, True Bugs, Hoppers, Aphids, and allies) are Small Milkweed Bug (about 10%) and North American Common Water Strider (about 10%), with each one's daily chance of a sighting.
GBIF citizen-science records
It is estimated from how often the Ambrysus mormon is recorded against all the insects logged in Yellowstone National Park (9 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.
