Operophtera occidentalis
In 3 days ~10% in a week ~20%
| # | Park | Country | Daily sighting probability |
|---|
More parks will be added in future updates.
Rare
Under 5% of wildlife watchers report a Western Bruce Spanworm sighting in Seattle on a given day, based on 21 verified sightings from GBIF citizen-science data. It is the 253rd 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.
December
In that month about 10% of wildlife watchers report a Western Bruce Spanworm in Seattle on a given day, against under 5% in January to November, the lowest months. That is one of Seattle's wettest months, with about 180 mm of rain against 20 mm in July.
Among the best
Of the 2 cities where we can rate Western Bruce Spanworm sightings, Seattle ranks 2nd at under 5%, level with the leaders once rounded. The best odds are in Portland (United States, under 5%).
Same family: Geometridae
The closest relatives of the Western Bruce Spanworm 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 Western Bruce Spanworm is recorded against all the insects logged in Seattle (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.
