Northeastern Hammertail

Northeastern Hammertail

Efferia aestuans

Daily sighting probability <5% · Rare
at Washington

In 3 days ~10% in a week ~20%

21 Verified sightings at Washington
July Best month

Global Distribution

Parks Where Found

# Park Country Daily sighting probability

More parks will be added in future updates.

Cities Where Found

# City Country Daily sighting probability
1 Boston 🇺🇸 United States
~10%
2 Detroit 🇺🇸 United States
~10%
3 New York City 🇺🇸 United States
~10%
4 Toronto 🇨🇦 Canada
~10%
5 Chicago 🇺🇸 United States
<5%
6 Philadelphia 🇺🇸 United States
<5%
7 Baltimore 🇺🇸 United States
<5%
8 Washington 🇺🇸 United States
<5%
9 Minneapolis [Saint Paul] 🇺🇸 United States
<5%
10 Dallas 🇺🇸 United States
<5%

Closest Relatives at Washington

Eastern Lion Fly

Eastern Lion Fly

☀️ Diurnal Insect

Promachus rufipes

Daily sighting probability ~10% · With luck
Plain-Tailed Hanging Thief

Plain-Tailed Hanging Thief

☀️🌙 Day & Night Insect

Diogmites neoternatus

Daily sighting probability ~10% · With luck
Common Micropanther

Common Micropanther

☀️ Diurnal Insect

Atomosia puella

Daily sighting probability <5% · Rare
Eastern Twigsitter

Eastern Twigsitter

Insect

Heteropogon macerinus

Daily sighting probability <5% · Rare
Eastern Yellow-Backed Laphria

Eastern Yellow-Backed Laphria

☀️ Diurnal Insect

Laphria thoracica

Daily sighting probability <5% · Rare
Eight-Spotted Rainbow Robber

Eight-Spotted Rainbow Robber

Insect

Taracticus octopunctatus

Daily sighting probability <5% · Rare
Black-Backed Lampria

Black-Backed Lampria

Insect

Lampria bicolor

Daily sighting probability <5% · Rare
Asilus flavofemoratus

Asilus flavofemoratus

Insect

Asilus flavofemoratus

Daily sighting probability <5% · Rare
Black-Booted Micropanther

Black-Booted Micropanther

Insect

Atomosia rufipes

Daily sighting probability <5% · Rare
Gray Goggle Eye

Gray Goggle Eye

☀️🌙 Day & Night Insect

Holcocephala calva

Daily sighting probability <5% · Rare
Yellow-Faced Micropanther

Yellow-Faced Micropanther

Insect

Cerotainia macrocera

Daily sighting probability <5% · Rare
Eastern Calligrapher

Eastern Calligrapher

☀️ Diurnal Insect

Toxomerus geminatus

Daily sighting probability ~10% · With luck

Before you go

What are the chances of seeing a Northeastern Hammertail in Washington?

Rare

Under 5% of wildlife watchers report a Northeastern Hammertail sighting in Washington on a given day, based on 21 verified sightings from GBIF citizen-science data. It is the 784th most-seen of the 1807 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.

When is the best time to see a Northeastern Hammertail in Washington?

Any time of year

In every month with enough records, under 5% of wildlife watchers report a Northeastern Hammertail in Washington on a given day, so our monthly data shows no clear season.

Is Washington the best place to see a Northeastern Hammertail?

8th of 10

Of the 10 cities where we can rate Northeastern Hammertail sightings, Washington ranks 8th at under 5%. The best odds are in Boston (United States, about 10%), Detroit (United States, about 10%) and New York City (United States, about 10%).

Which relatives of the Northeastern Hammertail live in Washington?

Same family: Asilidae

The closest relatives of the Northeastern Hammertail that you can see in Washington (family Asilidae, Robber Flies) are Eastern Lion Fly (about 10%) and Plain-Tailed Hanging Thief (about 10%), with each one's daily chance of a sighting.

Where does the Northeastern Hammertail sighting chance come from?

GBIF citizen-science records

It is estimated from how often the Northeastern Hammertail is recorded against all the insects logged in Washington (21 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.

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