For years, only the most intrepid birdwatcher could catch a glimpse of the world's fastest animal, the peregrine falcon, around wild crags, quarries or perched on cliffs thousands of feet above the sea. But now the regal bird of prey is returning to Britain's cities in droves, with more pairs spotted in the capital this year than for centuries before. The blue-grey falcon, with its yellow feet, black talons and white-goateed face, can travel at speeds in excess of 200mph when diving for its prey – mainly pigeons – placing it at the top of the avian food chain. Driven out of urban centres over the past 100 years, it is now back and nesting at spots such as London's Tate Modern, Manchester's Arndale centre and at Durham and Chichester Cathedrals. The number of peregrines in the UK has increased more than fourfold since the 1960s when the population was devastated by the effects of organochlorine pesticide, which thinned the walls of their eggs and brought numbers down to about 360 pairs. There are now thought to be 1,500 pairs across the country, 24 of which live in London – the highest number recorded in the city for hundreds of years. Paul Stancliffe, a bird specialist at the British Trust for Ornithology, said: "Since the banning of certain pesticides, the peregrines have bounced back. More and more are spreading out looking for new territories. "They favour places with abundant food that are inaccessible to other predators. As those prime territories get taken up, young birds look for new spaces – buildings in cities and towns provide perfect cliff-like locations." In what is being hailed as one of nature's "success stories", two of the peregrines that have recolonised London – the city's population has gone from zero to almost capacity in a decade – can now be seen perching on the chimney of Tate Modern. the above two articles are freely available in the press yet still the RSPB tell lies about the numbers ....