Individuals ringed on Nan Ron and then caught again on the island are low. For many they constitute the young 'wanderers' - those birds of insufficient maturity to breed who pop in to investigate the lures as representative of potential breeding sites and then move on to prospect elsewhere. Other birds captured of an age greater than 3 years old are considered to be breeders.
Of the four birds caught this year in this category all four can be considered breeders.
Results have been received on another 26 birds that were originally ringed elsewhere, now caught on Nan Ron. The four highlighted could be considered as breeders as all are greater than 3 years old - and thus should be breeding. It is possible however that they could be failed breeders for the year who are 'wandering' to explore more potential succesful breeding sites.
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