Wild peregrines’ nests are usually inaccessible or the birds not human tolerant. These rare images show the nesting cycle of wild peregrine falcons, with the Chicago skyline as a stunning backdrop

13/05/2015: Peregrines are adapting to breeding in cities around the world. The tall office blocks and apartments are seen by them as pseudo cliffs

13/05/2015: Chicago is situated on major migrant flyway, so a steady stream of prey is present for the peregrines