The adult peregrine is a crow-sized bird with a 36 to 44 inch wingspan. Young birds have darker, brownish plumage. Their breast is marked with vertical brown streaking. Peregrines may live to be 12 to 15 years old. This means that approximately 6 of every 10 falcons hatched will die in its first year of life.
Peregrines typically nest on ledges of rock cliffs.
However, falcons have been able to adapt to use tall buildings. If you think about it, a city skyscraper is tall and constructed of concrete or stone, just like a rock cliff. Window boxes and other niches on buildings provide a place for a female to lay eggs. Man-made nest boxes and trays lined with pea gravel are also used by falcons. Peregrine falcons do not bring nesting material to an area to build a nest.