Presumed 4CY Herring Gull x Lesser Black-backed Gull – 20170604

Images of what I believe to be a fourth-calendar year Herring Gull x Lesser Black-backed Gull. Noticeable was the darker grey-tone and full black band on P5 (influence of a Lesser Black-backed Gull), with the posture and yellow eye ring of a Herring Gull. Also note the faint mirror on P10.

Seen in the gull colony of IJmuiden Forteiland, the Netherlands, 4 June 2017.

4kj-hybride-zilver-x-km-IJmuiden-4-Juni-2017-Maarten-van-Kleinwee-1

4kj-hybride-zilver-x-km-IJmuiden-4-Juni-2017-Maarten-van-Kleinwee-2

4kj-hybride-zilver-x-km-IJmuiden-4-Juni-2017-Maarten-van-Kleinwee-3

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