Note 643 — Chapter XXXIX · ON MANAGEMENT DURING THE MOULT
D. C. (Douglas Craven) Phillott translation
I one year, in Kohat, India, tried moulting a young (chūz) peregrine in a large outhouse, high and roomy. The hawk did not moult at all, and frequently got so fat and heavy that she was unable to fly up to her perch until her food was reduced for a day or two. However, falconers in England recommend keeping a moulting hawk loose in a loft.