Received: 7 February 2019
Accepted: 17 April 2019
First Online: 24 May 2019
Ethics approval and consent to participate
: We have permission to work in the colony and catch, ring and tag Herring Gulls under the permit Art 75 of the Dutch ‘Flora & Faunawet’ FF/75A/2014003, an annually renewed ringing permit issued by Vogeltrekstation Wageningen for ringer-licensed E29 Camphuysen, an annually renewed research permit issued by Saatsbosbeheer Divisie grond en gebouwen, and a permit for animal experiments (tracking herring gulls) issued by the ‘Nederlandse Voedsel- en Warenautoriteit’, Ministry of Economics, TRC/VWA/20132090.
: Not applicable.
: The authors declare that they have no competing interests.
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