By mid-January the majority will be paired and the females stop singing. Male robins continue singing, declaring what has become a joint future breeding territory. On occasions singing lasts into the night especially where street lights are prominent. Detailed research shows that a few robins hold more than one territory simultaneously for up to six weeks. These are usually adult males moving up to a third of a mile between breeding and winter territories.
British robins are largely resident.
However some, mostly females, cross the Channel to spend the winter as far south as southern Spain and Portugal. A dangerous option even though the birds then become extremely secretive. At the same time there is an influx here of Continental robins from Scandinavia and Russia avoiding the severe northern winter.