I began ringing at Newthorpe Sewage Works in June 2012, mainly to monitor the Swallows, House Martins, Sand Martins and Swifts which are present during the summer months. However it seemed a wasted opportunity not to ring there through the rest of the year and to see what birds use the site through the winter months.
Even though few birds are caught in winter, it proved to be a good decision because when I submitted my latest data, Kev noticed an interesting Chiffchaff entry.
This bird was first ringed on 11 January 2014 and given the age code of 6, meaning it was an adult which had hatched before 2013. This bird has subsequently been retrapped every year since and around the same date, the 16 January 2015 and the 15 January 2016.
I guess this shows how some warblers overwinter in the UK and how important certain sites may be to their survival.