Bonaparte's Gull
Chroicocephalus philadelphia
Sightings of Bonaparte's Gull run from early January to early December, peaking early January.
Sighting 139 observationsMost recent: Jul 10, 202628 states/provinces
Sighting real observations of Bonaparte's GullOpen in full map →
When it's seen
Share of Bonaparte's Gull observations by week of the year, across its North American range.
early January
mid January
mid January
late January
early February
early February
mid February
late February
early March
early March
mid March
late March
late March
early April
mid April
mid April
late April
early May
early May
mid May
late May
late May
early June
mid June
late June
late June
early July
mid July
mid July
late July
early August
early August
mid August
late August
late August
early September
mid September
mid September
late September
early October
mid October
mid October
late October
early November
early November
mid November
late November
late November
early December
mid December
mid December
late December
Jan
Feb
Mar
Apr
May
Jun
Jul
Aug
Sep
Oct
Nov
Dec
Where it's seen most
British Columbia44 →Nova Scotia18 →Ontario17 →California13 →Ohio4 →Prince Edward Island4 →Illinois3 →New York3 →New Brunswick3 →Manitoba3 →Florida2 →Alberta2 →
Tap a state for Bonaparte's Gull's local arrival & departure timing.
Data: iNaturalist research-grade observations (CC0 / CC-BY), via GBIF. Excludes eBird.