Haematopis grataria
In 3 days ~30% in a week ~60%
Haematopis is a monotypic moth genus in the family Geometridae erected by Jacob Hübner in 1823. Its only species, Haematopis grataria, the chickweed geometer, was first described by Johan Christian Fabricius in 1823. It is found throughout the United States. In Canada it is found from Quebec to Alberta, north to the Northwest Territories.
The wingspan is 20–25 millimeters (0.79–0.98 in). Adults are on wing from May to October. It is a day-flying species. The larvae feed on various low-growing plants, including Stellaria, Polygonum and clover. Wikipedia →
| # | Park | Country | Daily sighting probability |
|---|---|---|---|
| 1 | Point Pelee National Park | 🇨🇦 Canada | |
| 2 | Shenandoah National Park | 🇺🇸 United States |
| # | City | Country | Daily sighting probability |
|---|---|---|---|
| 1 | Minneapolis [Saint Paul] | 🇺🇸 United States | |
| 2 | Detroit | 🇺🇸 United States | |
| 3 | Chicago | 🇺🇸 United States | |
| 4 | Toronto | 🇨🇦 Canada | |
| 5 | Philadelphia | 🇺🇸 United States | |
| 6 | Montreal | 🇨🇦 Canada | |
| 7 | Washington | 🇺🇸 United States | |
| 8 | New York City | 🇺🇸 United States | |
| 9 | Baltimore | 🇺🇸 United States | |
| 10 | Dallas | 🇺🇸 United States |
With luck
About 10% of wildlife watchers report a Chickweed Geometer Moth sighting in Detroit on a given day, based on 35 verified sightings from GBIF citizen-science data. It is the 54th most-seen of the 268 insects we can rate there. Over three days the chance rises to about 30%, and over a week to about 60%, if each day is a fresh chance.
September
In that month about 20% of wildlife watchers report a Chickweed Geometer Moth in Detroit on a given day, against under 5% in June and November–April, the lowest months.
Between 9 pm and midnight
Across all the parks we cover, that three-hour window holds the most Chickweed Geometer Moth sightings with a recorded time, and about half of them come between 6 am and 6 pm: it is seen both by day and at night.
Among the best
Of the 12 cities where we can rate Chickweed Geometer Moth sightings, Detroit ranks 2nd at about 10%, level with the leaders once rounded. The best odds are in Minneapolis [Saint Paul] (United States, about 10%).
Same family: Geometridae
The closest relatives of the Chickweed Geometer Moth that you can see in Detroit (family Geometridae, Geometer Moths) are Lesser Maple Spanworm Moth (about 10%), Dark-Barred Twin-Spot Carpet (about 10%) and Pale Beauty (about 10%), with each one's daily chance of a sighting.
GBIF citizen-science records
It is estimated from how often the Chickweed Geometer Moth is recorded against all the insects logged in Detroit (35 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.
