Bug FAQWhite-winged March Fly
Bibio albipennis · Order: Diptera · Family: Bibionidae
The white-winged march fly is found throughout North America. Its larvae feed on dead organic material. Robins eat the larvae as a seasonal food source.
Source: Wikipedia
What it eats
Larvae are detritivores, consuming decaying matter. Robins use the larvae as a seasonal food source.
Source: Wikipedia
Where it comes from
It is native to and widespread across North America.
Source: Wikipedia
Where it is found in the US
Recorded in 43 of 51 states and DC. Most records: California, Washington, Utah, Vermont, Ohio, Maryland, Michigan, New York.
Darker = more records. Counts are museum and citizen-science records, not population size.
Source: GBIF
Status: native in North America; native in United States; native in Canada. Source: iNaturalist
Months it is reported in the US
Source: GBIF
More photos
Questions people ask
What do the larvae of the white-winged march fly eat?
They feed on dead organic material as detritivores.
Source: Wikipedia
Do any birds eat white-winged march fly larvae?
Robins eat them as a seasonal food source.
Source: Wikipedia
Same family (Bibionidae)
Sources
- Wikipedia: https://en.wikipedia.org/wiki/Bibio_albipennis
Look it up elsewhere: GBIF · iNaturalist · BugGuide · Wikipedia
Text written 2026-10-22 from the sources above and checked sentence by sentence against them. Data fetched 2026-10-22.