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Once you set one foot in Regent's Park (or any other park in central London for that matter) they're already there, watching you. An army of squirrels and pigeons watching your every move, analysing whether you might have some delicious food to share with them. And "share" in this case doesn't necessarily mean you agree so protect your food well, and have your camera ready!
On the fourth of June, I enjoyed the sun in Regent's Park and went to the London Green Fair.