Generally three to four eggs, but sometimes as few as one or as many as five, are laid in the scrape. There is an exception to this behavior. The more contaminated insects they ate, the more they themselves became contaminated. London: HarperCollins. The Black Shaheen Falcon. State of Queensland Environmental Protection Agency. Young beg for food with a call similar to: “screea, screea, screea. To keep her attention, males bring females food during the courting and nesting season. Tell me more. History at your fingertips.
Prior to egg-laying, the pair will engage in incredible aerial displays, involving power dives, tight cornering, high soaring, and body rolls during a dive. They nest on cliff faces and crevices. This procedure is called hacking back to the wild. A Falconry Manual. No nest materials are added. The peregrine then carries the prey back to an eating perch. Grainger Hunt.
In the mids, the pesticide DDT was having a devastating effect on many bird species and other wildlife across North America. The Peregrine Falcon was no exception. By the s, Peregrine Falcons were gone from the eastern United States and large portions of the western states due to the effects of this pesticide. At the time, DDT was being sprayed in agricultural fields, marshes, and other landscapes as a means to control insect infestations. When small birds ate insects contaminated by this pesticide, some of this chemical remained in their bodies. The more contaminated insects they ate, the more they themselves became contaminated. Their eggs lacked calcium, which meant they were thin-shelled and weak.