Four lions are detailed to guard a monument

I took this photo in Trafalgar Square in Central London, England. There is Charing Cross Tube station right under the square. The public square has Nelson's Column which is guarded by four bronze male lions and the photo shows one of them. I visited the square three times. When I visit there for the first time, the square was used for a political demonstration and was packed like sardines. So I visited there again for the second time and I could take this photo.