Young peregrine falcons typically leave their nesting site (fledge) at around 35-42 days old. After fledging, they usually depend on their parents for food and protection for several weeks. Here's a rough outline of their development: 1. *Fledging (35-42 days)*: Young peregrines leave the nest and start flying. 2. *Post-fledging (1-2 weeks)*: They learn to fly and hunt, still relying on parents for food. 3. *Independence (4-6 weeks)*: Young peregrines become more self-sufficient, gradually reducing their dependence on parents. 4. *Dispersal (1-3 months)*: They start to move away from their birthplace, exploring new areas. Keep in mind that these timelines can vary depending on factors like food availability, predation, and environmental conditions.