Thallophaga hyperborea
In 3 days ~10% in a week ~20%
Thallophaga hyperborea, the northern thallophaga, is a moth of the family Geometridae. The species was described by George Duryea Hulst in 1900. It occurs in Western North America, from California, USA, to British Columbia, Canada, and the Alaskan Panhandle.
The wingspan is 30–37 mm (1.2–1.5 in). Adults emerge from April to May. The larvae feed on western hemlock, Douglas fir, red cedar, and other fir species. The moth has also been recorded on willow and alder, as well as other conifers. Wikipedia →
| # | Park | Country | Daily sighting probability |
|---|---|---|---|
| 1 | Redwood National Park | 🇺🇸 United States |
More parks will be added in future updates.
Rare
Under 5% of wildlife watchers report a Northern Thallophaga sighting in Seattle on a given day, based on 18 verified sightings from GBIF citizen-science data. It is the 199th most-seen of the 428 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.
March and April
In those months about 10% of wildlife watchers report a Northern Thallophaga in Seattle on a given day, against under 5% in May to February, the lowest months.
Between 11 am and 2 pm
Across all the parks we cover, that three-hour window holds the most Northern Thallophaga sightings with a recorded time, and nearly all of them come between 6 am and 6 pm: it is a daytime animal.
Yes
Of the 2 cities where we can rate Northern Thallophaga sightings, Seattle has the highest daily chance: under 5%. Next come Portland (United States, under 5%).
Same family: Geometridae
The closest relatives of the Northern Thallophaga that you can see in Seattle (family Geometridae, Geometer Moths) are Tissue Moth (about 10%), Omnivorous Looper (about 10%) and Small Dusty Wave (about 10%), with each one's daily chance of a sighting.
GBIF citizen-science records
It is estimated from how often the Northern Thallophaga is recorded against all the insects logged in Seattle (18 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.
