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 Portland on a given day, based on 8 verified sightings from GBIF citizen-science data. It is the 378th most-seen of the 507 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.
February and March
In those months about 10% of wildlife watchers report a Northern Thallophaga in Portland on a given day, against under 5% in April to January, 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.
Among the best
Of the 2 cities where we can rate Northern Thallophaga sightings, Portland ranks 2nd at under 5%, level with the leaders once rounded. The best odds are in Seattle (United States, under 5%).
Same family: Geometridae
The closest relatives of the Northern Thallophaga that you can see in Portland (family Geometridae, Geometer Moths) are Brown-Lined Looper (about 10%), Tissue Moth (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 Portland (8 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.
