Note 650 — Chapter XL · REMEDIES FOR SLOW MOULTING
D. C. (Douglas Craven) Phillott translation
This is not the experience of Indian falconers. In a wild state peregrines moult late; doubtless the duties of maternity retard moulting. I have twice caught healthy haggard peregrine “falcons” at Christmas that still had an unshed flight-feather.