Black-headed Gull Chroicocephalus ridibundus(last update: |
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June 13, 2009, Starrevaart, Leidschendam, The Netherlands (52.10N 04.43E). Photo: Maarten van Kleinwee.A juvenile Black-headed Gull lands amidst two other juveniles. Thinking that it is one of their parents returning, they immediately start begging for food by assuming the hunched position. |