Enallagma praevarum
In 3 days ~10% in a week ~20%
The arroyo bluet (Enallagma praevarum) is a damselfly of the family Coenagrionidae, native to the western United States, south to southern Mexico. It is associated with slow-flowing streams or lake margins with emergent vegetation.
Males have blue eyes, accompanied by oval, raindrop shaped turquoise spots above each eye. Their abdomen is blue with large black rectangular spots lining the top, ending in an abdomen tip of the same color set. Females possess the same build as males, but can also be found in tan or lighter blue shades rather than turquoise. Their legs are a lighter brown color (as opposed to black), and the spots above their eyes are usually larger than their male counterparts.
Arroyo Bluets occupy both the west coast of Southern California and the region of sagebrush along the northeastern California border. The elevations at which the Arroyo bluet can be most commonly found are best described as intermediate. In northeastern California, the Arroyo Bluet has been recorded from sea level at elevations up to 4,600 feet or 1,400 meters. These damselflies are abundant in... Wikipedia →
| # | Park | Country | Daily sighting probability |
|---|---|---|---|
| 1 | Saguaro National Park | 🇺🇸 United States |
More parks will be added in future updates.
| # | City | Country | Daily sighting probability |
|---|---|---|---|
| 1 | Sacramento | 🇺🇸 United States | |
| 2 | Denver | 🇺🇸 United States | |
| 3 | Los Angeles | 🇺🇸 United States | |
| 4 | San Francisco | 🇺🇸 United States |
Rare
Under 5% of wildlife watchers report an Arroyo Bluet sighting in Sacramento on a given day, based on 14 verified sightings from GBIF citizen-science data. It is the 222nd most-seen of the 386 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.
April and September
In those months about 10% of wildlife watchers report an Arroyo Bluet in Sacramento on a given day, against under 5% in May–August and October–March, the lowest months. Those are among Sacramento's driest months, with about 25 mm of rain a month against 120 mm in December.
Between noon and 3 pm
Across all the parks we cover, that three-hour window holds the most Arroyo Bluet sightings with a recorded time, and nearly all of them come between 6 am and 6 pm: it is a daytime animal.
Yes
Of the 4 cities where we can rate Arroyo Bluet sightings, Sacramento has the highest daily chance: under 5%. Next come Denver (United States, under 5%) and Los Angeles (United States, under 5%).
GBIF citizen-science records
It is estimated from how often the Arroyo Bluet is recorded against all the insects logged in Sacramento (14 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.
