Dave Bishop sighted two of our Weymouth ringed Herring Gulls at Radipole Lake Weymouth.

Herring Gull 756 on the 13th Jan 2019 first sighting since ringing. Which has an over shot upper mandible. This wasn't evident at the time of ringing in July 2018.

As this is the second Herring Gull we have ringed in Weymouth with or has developed an over shot mandible, it prompted a Google search for more information.

Although not common it does occur in several different species of Gull. Being recorded in a Kelp Gull in France and  Gulls in North America. What causes this to happen as yet haven't found any information , if anyone can elighten us as to the cause please do?

Herring Gull 731 was sighted at Radipole Lake on the 15th Jan 2019.