It is hardly remarkable but the alterations to the weather appear to have changed the migrating patterns of birds that spend part of their year in the UK (https://www.abdn.ac.uk/news/9998/). The birds seem to stay longer (several weeks) before making their return flights. Migration is energetically demanding and is generally undertaken to maximise feeding and breeding opportunities. A milder year might mean that birds (especially insectivores) can feed here for longer before seeking warmer conditions with longer periods of daylight.
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