Efferia albibarbis
In 3 days ~10% in a week ~30%
Efferia albibarbis is a species of robber fly in the family Asilidae. It is a known predator of Cicindela hirticollis and Habroscelimorpha dorsalis dorsalis. Wikipedia →
| # | Park | Country | Daily sighting probability |
|---|---|---|---|
| 1 | Merritt Island National Wildlife Refuge | 🇺🇸 United States | |
| 2 | Joshua Tree National Park | 🇺🇸 United States |
| # | City | Country | Daily sighting probability |
|---|---|---|---|
| 1 | Sacramento | 🇺🇸 United States | |
| 2 | New York City | 🇺🇸 United States | |
| 3 | Miami | 🇺🇸 United States | |
| 4 | Chicago | 🇺🇸 United States | |
| 5 | Los Angeles | 🇺🇸 United States |
Rare
Under 5% of wildlife watchers report a Sand Hammertail sighting in Joshua Tree National Park on a given day, based on 6 verified sightings from GBIF citizen-science data from 2019 to 2026. It is the 164th most-seen of the 190 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.
May, August and October
In those months about 10% of wildlife watchers report a Sand Hammertail in Joshua Tree National Park on a given day, against under 5% in June–July, September and November–April, the lowest months.
Between 2 and 5 pm
Across all the parks we cover, that three-hour window holds the most Sand Hammertail sightings with a recorded time, and about 9 in 10 of them come between 6 am and 6 pm: it is a daytime animal.
2nd of 2
Of the 2 parks where we can rate Sand Hammertail sightings, Joshua Tree National Park ranks 2nd at under 5%. The best odds are in Merritt Island National Wildlife Refuge (United States, about 10%).
Same order: Diptera
The closest relatives of the Sand Hammertail that you can see in Joshua Tree National Park (order Diptera, Flies) are Large Creosote Gall Midge (about 40%), Large-Tailed Aphideater (about 10%) and Creosote Cone Gall Midge (about 10%), with each one's daily chance of a sighting.
GBIF citizen-science records
It is estimated from how often the Sand Hammertail is recorded against all the insects logged in Joshua Tree National Park (6 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.
