Crambus praefectellus
In 3 days ~10% in a week ~20%
Crambus praefectellus, the common grass-veneer or silver-striped webworm, is a moth of the family Crambidae described by Johann Leopold Theodor Friedrich Zincken in 1821. It is found in the United States and southern Canada east of the Rocky Mountains.
The wingspan is 18–25 mm. Adults are on wing from May to September in the north, from April to October in the mid latitudes and probably year round in southern Florida and Texas. The larvae feed on various grasses and cereal grains. Wikipedia →
| # | Park | Country | Daily sighting probability |
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More parks will be added in future updates.
Rare
Under 5% of wildlife watchers report a Common Grass-Veneer sighting in Chicago on a given day, based on 50 verified sightings from GBIF citizen-science data. It is the 245th most-seen of the 978 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.
June and August
In those months about 10% of wildlife watchers report a Common Grass-Veneer in Chicago on a given day, against under 5% in July and September–May, the lowest months.
3rd of 8
Of the 8 cities where we can rate Common Grass-Veneer sightings, Chicago ranks 3rd at under 5%. The best odds are in Boston (United States, about 10%) and Montreal (Canada, under 5%).
GBIF citizen-science records
It is estimated from how often the Common Grass-Veneer is recorded against all the insects logged in Chicago (50 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.
