Lethocerus americanus
Silhouette: TGHays · PhyloPic
In 3 days ~20% in a week ~40%
Lethocerus americanus, sometimes called the electric light bug, toe biter or fish killer, is a giant water bug in the family Belostomatidae, native to southern Canada and the United States (north of 35°N; other Lethocerus species are found southwards). It typically has a length around 5–6 cm (2.0–2.4 in). It was originally classified as a species in the genus Belostoma.
Commonly found in ponds, marshes, and on the edges of lakes and slow-moving streams and creeks, adults and larvae feed on other insects, small crustaceans (crabs/crayfish), tadpoles/frogs, snails, and small fish. The adult swims with the aid of its hind legs. A pair of front fore limbs is used for capturing and latching onto its intended prey, which it then injects with digestive toxins through a somewhat retractable proboscis much like that of a mosquito. L. americanus tends to let its prey digest for 10–15 minutes before eating. Multiple L. americanus bugs have been seen to hunt and then share the same prey animal. Under water, the adult breathes air that it traps under its wings using two snorkel-like tubes that extend from the rear of its abdomen.
Commonly known as "toe biter", L. americanus may deliver... Wikipedia →
| # | Park | Country | Daily sighting probability |
|---|---|---|---|
| 1 | Riding Mountain National Park | 🇨🇦 Canada | |
| 2 | Great Bear Rainforest | 🇨🇦 Canada | |
| 3 | Acadia National Park | 🇺🇸 United States |
| # | City | Country | Daily sighting probability |
|---|---|---|---|
| 1 | Minneapolis [Saint Paul] | 🇺🇸 United States | |
| 2 | Edmonton | 🇨🇦 Canada | |
| 3 | Calgary | 🇨🇦 Canada | |
| 4 | Montreal | 🇨🇦 Canada | |
| 5 | Vancouver | 🇨🇦 Canada | |
| 6 | Salt Lake City | 🇺🇸 United States | |
| 7 | Boston | 🇺🇸 United States | |
| 8 | Toronto | 🇨🇦 Canada |
With luck
About 10% of wildlife watchers report an American Giant Water Bug sighting in Acadia National Park on a given day, based on 11 verified sightings from GBIF citizen-science data from 2019 to 2026. It is the 187th most-seen of the 405 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.
April–June and September–October
In those months about 10% of wildlife watchers report an American Giant Water Bug in Acadia National Park on a given day, against under 5% in July–August and November–March, the lowest months.
Between 9 am and noon
Across all the parks we cover, that three-hour window holds the most American Giant Water Bug sightings with a recorded time, and about 7 in 10 of them come between 6 am and 6 pm: it is a daytime animal.
Among the best
Of the 3 parks where we can rate American Giant Water Bug sightings, Acadia National Park ranks 3rd at about 10%, level with the leaders once rounded. The best odds are in Riding Mountain National Park (Canada, about 10%) and Great Bear Rainforest (Canada, about 10%).
Same order: Hemiptera
The closest relatives of the American Giant Water Bug that you can see in Acadia National Park (order Hemiptera, True Bugs, Hoppers, Aphids, and allies) are Western Conifer Seed Bug (about 20%), Pale Green Assassin 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 American Giant Water Bug is recorded against all the insects logged in Acadia National Park (11 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.
