London has plenty of countryside-within the M25 there are 96 farms and at least 6,800 head of cattle. For more than a century, there has been a policy of preserving outstanding countryside threatened with development and these 'green lungs' provide enjoyable opportunities for walking. Cows, horses and beehives can be found at Mill Hill, for example, while further south cattle graze on the Thameside Meadow at Syon, and deer run free at Hampton Court. Even Regent's Park, in the heart of central London, takes on an old country mantle in autumn and winter when there are fewer visitors, and provides peaceful walks away from the capital's traffic.