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In 2014, 24 ground-nesting Lesser Black-backed Gulls were caught and tagged in the port of Zeebrugge, and 8 Herring Gulls on the roof of the Vismijn in Ostend, all using a walk-in cage. Additionally, 1 ground nesting Herring Gull was caught in the port of Zeebrugge and 3 Herring Gulls were caught with a small canon net when feeding on the Visserskaai in Ostend. Biometrics were taken of all captured gulls (bill length, bill depth, tarsus length, wing length, and body mass) as well as a feather sample to determine the sex.
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