Efferia aestuans
In 3 days ~40% in a week ~60%
| # | Park | Country | Daily sighting probability |
|---|
More parks will be added in future updates.
| # | City | Country | Daily sighting probability |
|---|---|---|---|
| 1 | Boston | 🇺🇸 United States | |
| 2 | Detroit | 🇺🇸 United States | |
| 3 | New York City | 🇺🇸 United States | |
| 4 | Toronto | 🇨🇦 Canada | |
| 5 | Chicago | 🇺🇸 United States | |
| 6 | Philadelphia | 🇺🇸 United States | |
| 7 | Baltimore | 🇺🇸 United States | |
| 8 | Washington | 🇺🇸 United States | |
| 9 | Minneapolis [Saint Paul] | 🇺🇸 United States | |
| 10 | Dallas | 🇺🇸 United States |
With luck
About 10% of wildlife watchers report a Northeastern Hammertail sighting in Boston on a given day, based on 326 verified sightings from GBIF citizen-science data. It is the 45th most-seen of the 1200 insects we can rate there. Over three days the chance rises to about 40%, and over a week to about 60%, if each day is a fresh chance.
July
In that month about 40% of wildlife watchers report a Northeastern Hammertail in Boston on a given day, against under 5% in September to May, the lowest months.
Yes
Of the 10 cities where we can rate Northeastern Hammertail sightings, Boston has the highest daily chance: about 10%. Next come Detroit (United States, about 10%) and New York City (United States, about 10%).
Same family: Asilidae
The closest relatives of the Northeastern Hammertail that you can see in Boston (family Asilidae, Robber Flies) are Stripe-Legged Robber Fly (about 10%) and Eastern Yellow-Backed Laphria (about 10%), with each one's daily chance of a sighting.
GBIF citizen-science records
It is estimated from how often the Northeastern Hammertail is recorded against all the insects logged in Boston (326 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.
