Rhionaeschna californica
In 3 days ~20% in a week ~40%
Rhionaeschna californica, the California darner, is a species of darner in the dragonfly family Aeshnidae. It is commonly found in Central America, along the West Coast of the United States, and in Southwestern Canada. The California darner prefers habitats like lakes, ponds, marshes and stream pools with edge vegetation including many with alkaline water conditions Larvae sustain themselves on a diet of aquatic insects, very small fish and tadpoles. The adult-stage will eat almost any soft-bodied flying insect.
The IUCN conservation status of Rhionaeschna californica is "LC", least concern, with no immediate threat to the species' survival. The population is stable. The IUCN status was reviewed in 2017. As an adult, the California darner is described as a medium-sized dragonfly, typically measuring between 5.7 and 6.4 centimetres (2+1⁄4 and 2+1⁄2 in) in length. California darners are best distinguished by their distinct bright blue diagonal spots on their abdomen.
Male California darners have a dark brown to brownish-black body with two blue or green diagonal stripes across each side of the thorax, while the top thorax is plain in color. Most females are polymorphic... Wikipedia →
| # | Park | Country | Daily sighting probability |
|---|---|---|---|
| 1 | Redwood National Park | 🇺🇸 United States |
More parks will be added in future updates.
| # | City | Country | Daily sighting probability |
|---|---|---|---|
| 1 | Portland | 🇺🇸 United States | |
| 2 | Seattle | 🇺🇸 United States | |
| 3 | Vancouver | 🇨🇦 Canada | |
| 4 | San Francisco | 🇺🇸 United States |
With luck
About 10% of wildlife watchers report a California Darner sighting in Portland on a given day, based on 74 verified sightings from GBIF citizen-science data. It is the 106th most-seen of the 507 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 to June
In those months about 10% of wildlife watchers report a California Darner in Portland on a given day, against under 5% in July to March, the lowest months.
Between 1 and 4 pm
Across all the parks we cover, that three-hour window holds the most California Darner sightings with a recorded time, and about 9 in 10 of them come between 6 am and 6 pm: it is a daytime animal.
Yes
Of the 4 cities where we can rate California Darner sightings, Portland has the highest daily chance: about 10%. Next come Seattle (United States, about 10%) and Vancouver (Canada, under 5%).
GBIF citizen-science records
It is estimated from how often the California Darner is recorded against all the insects logged in Portland (74 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.
