Grey squirrels in UK 'should be culled' The government is reviewing the way grey squirrel numbers are managed in England, and is assessing whether more needs to be done to control numbers. The grey squirrel population has rocketed over the past 100 years. Originally introduced from America, they are now officially classed as pests in the UK and have long been blamed for the decline of native red squirrels. BBC Breakfast's Tim Muffett reports.