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Wing Tagging Marsh Harriers  Circus Aeruginosus in Norfolk

Although for many years continental ringers had been using a method developed by the Dutch to sex Marsh Harrier nestlings in the nest it was not used in Britain. North West Norfolk RG had been pioneering work on developing a method to sex Marsh Harrier nestlings using the Dutch protocol prior to the wing tagging project and was able to present enough evidence to the British Trust for Ornithology(BTO) for  them to adopt it. This means that it is now a mandatory prerequisite that nestlings must be sexed before ringing with the correct size ring as males and females take different size rings. Males must be fitted with size F and females size G.
The Project provided an ideal opportunity to develop the method further with increased access to nests coming from participants in the Project.


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North West Norfolk Ringing Group

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Last updated January 2017