Another garden visitor

As well as the pigeons, we have this little visitor to our garden sometimes. I was quite delighted to see him/her until it jumped up onto the bird feeder, frightening away the birds, and started eating the fat ball. I wonder whether it is this squirrel who has been getting through the peanuts so fast. Whilst I believe everything has the right to feed, I was not too keen on it sitting on the bird table and shooed it away.