Peregrine falcon chick welfare during the critical nesting period depends on nest site protection, prey availability, and freedom from human disturbance.
Peregrine chicks disturbed from nests by climbers or photographers are left exposed to cold and predation while adults are absent. In cold weather, brief chilling can be fatal to young chicks. The welfare cost of a single disturbance event can be the death of an entire brood. Legal protection of nest sites combined with licensed watch schemes that deter disturbance provides the most effective protection for individual chick welfare.