What approximate percentage decrease in population has occurred in England over the last 25 years?
Answer
70% decrease
The text notes a worrying trend for the Willow Warbler in the British Isles, highlighting that the population in England has decreased by approximately 70% over the last 25 years. This significant decline is noted as being concentrated most severely in the southeast region of England, although some areas in Scotland have registered minor increases, suggesting regional variation within the UK.
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