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 |
With luck
About 10% of wildlife watchers report a Sand Hammertail sighting in Merritt Island National Wildlife Refuge on a given day, based on 8 verified sightings from GBIF citizen-science data from 2019 to 2026. It is the 150th most-seen of the 189 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.
June to September
In those months about 10% of wildlife watchers report a Sand Hammertail in Merritt Island National Wildlife Refuge on a given day, against under 5% in October to May, the lowest months. Those are among Merritt Island National Wildlife Refuge's wettest months, with about 180 mm of rain a month against 50 mm in March.
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.
Yes
Of the 2 parks where we can rate Sand Hammertail sightings, Merritt Island National Wildlife Refuge has the highest daily chance: about 10%. Next come Joshua Tree National Park (United States, under 5%).
Same order: Diptera
The closest relatives of the Sand Hammertail that you can see in Merritt Island National Wildlife Refuge (order Diptera, Flies) are White-Faced Plushback (about 10%), Black Horse Fly (about 10%) and Common Lovebug (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 Merritt Island National Wildlife Refuge (8 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.
