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A significant local rarity, with only a handful of records. Some individuals have stayed for long periods of time, returned to the same location over multiple years, and also wandered throughout the Great Lakes.
First Cycle
June
July
An almost inxpecable record of a juvenile plumaged Heermann's Gull exists from Michigan in July 2008.
August
September
October
November
December
January
February
March
April
May
Second Cycle / Adult
The change from first to second cycle depends on the timing of the start of the inner primary molt. May/June is used here as an inaccurate / arbitrary cutoff.
June
July
August
September
October
November
December
January
February
March
April
May
Third Cycle / Adult
Through their molt into third cycle plumage, Heermann's Gulls obtain an "adult" plumage for the rest of their lives.
June
July
August
September
October
November
December
January
February
March
April
May
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