One of my favourite ways to spend an idle day is to take a trip over to one of the larger parks or reserves in my local area and to spend some time with the grey squirrels. British parks support a larger population of squirrels than a similar area in the countryside because of the number of visitors who bring nuts to feed them. This keeps them well supplied during the warmer months, but during the winter when park visitors are less common, they have to rely on buried supplies - so during autumn (when these photos were taken), stockpiling is the chief activity. (Park squirrels share the stockpiled supplies; their home ranges inevitably overlap, and sense of smell, and not memory, appears to be the chief way of locating buried nuts).
Although in general you should not feed wild animals, as they can become dependent upon handouts and lose the ability to fend for themselves, there is no harm in feeding urban squirrels as they are already somewhat reliant on humans for their food, being partly domesticated. In fact, when food is scarce, urban grey squirrels are forced to raid people's trash, so it is better for everyone if park squirrels are kept comfortably fed. (Similarly, many bird species are dependent on handouts during winter - especially in the UK - and there is no harm in leaving out food for them).
The grey squirrel is not a native species to the United Kingdom, but was introduced from the United States in the nineteenth century. Although their presence has hurt the native red squirrels, this is largely because of a contagion for which the red squirrels had no resistance. Schemes in Scotland are now introducing resistance to the red squirrels, which is helping redress the balance, although fragmentation of forests is also having a negative effect on red squirrel population. Whilst red squirrels are shy and require patience and skill to locate, grey squirrels are bold and adventurous. I grew up on the Isle of Wight, which is one of the remaining habitats for red squirrels in the UK, so have been privileged to experience both species.
Grey squirrels in an urban environment do not tend to see people as a threat, but in common with many small mammals and birds retreat at speed from fast moving objects - if you're six inches tall, a fast moving object is likely to be a threat, and you can't afford to take the chance. As a result, befriending grey squirrels in a park is largely a case of being willing to sit still. You do not have to be motionless, but no sudden moves helps them come to trust you. Also, sitting on the ground helps - it reduces your height, which makes you seem less like a dangerous giant. Grey squirrels have a relentless curiosity, which means they will always come and investigate you, given time - you just have to convince them that you're a friend - or at the very least, something non-threatening which is giving out food.
Because of their tendency to retreat from anything moving fast, grey squirrels play dominance games based upon chasing each other. If a squirrel feels a rival has moved in on their territory (and some will see you as a part of their territory, while you are there), they will rush towards them - causing the interloper to scurry off. Chases often ensure, as the two squirrels rush at breakneck speed towards each other, often taking labyrinthine paths up and across trees. In general, they never actually touch or harm each other. The chase is what it's all about; there's no need for direct violence (although some scuffles do break out from time to time). Not all squirrels feel the need to exert dominance in this way; many are content to share space with their relatives and neighbours.
Squirrels don't like being touched, but will tolerate the odd bit of contact once they trust you. Conversely, they have no qualms at all about climbing on you - provided they trust you a great deal, and ideally when they are emboldened by being in large numbers. A lone squirrel isn't always certain what is safe, but like many animals they feel much more comfortable when there are more of their kind around them. This can even lead to dominance games in the form of dares - I can climb this human, and you don't have the nuts to do it! The day my wife took these photos, the squirrels were much too busy burying supplies for the winter, and hence I couldn't keep their attention for very long.
I'll leave you with this Quicktime movie of three squirrels taking nuts from my hand. If like me you are fond of squirrels, I encourage you to make the effort to take some nuts to your local parks during the winter - not only will they appreciate the meal during the leaner months, but they will be much more willing to relate to you, as hunger emboldens the most timid of beasts. Happy feeding!