Heermann's Gull
Heermann's gull (Larus heermanni) is a gull resident in the United States, Mexico and extreme southwestern British Columbia, nearly all nesting on Isla Rasa in the Gulf of California. They are usually found near shores or well out to sea, very rarely inland. The species is named after Adolphus Lewis Heermann, nineteenth-century explorer and naturalist.
Wikipedia ↗Wingspan and trait data: Fox et al. (2026), CC BY 4.0; incorporating AVONET (Tobias et al. 2022) and BirdWingData (Shiomi et al. 2025)
By hour of day
Counts reflect vocal activity and ambient noise, not abundance.
Recent days
Where heard
Home and away are counted separately everywhere except here.
Where it lives
Breeding and resident range, from BirdWeather. Not where you have heard it — that is the map on the Outings page.
Elsewhere
Recordings
Highest-confidence detections first. Confidence is a threshold, not a probability of being correct.