Is it Plucking, Molting or Over-preening? Why are those Feathers on the Cage Floor? - Windy City Parrot
Ruffed Grouse Preening - Winterberry Wildlife
Preening - Wikipedia
WILD GEORGIA: Birds must preen regularly for healthy feathers
Any advice on how to stop a conure from over-preening? : r/parrots
National Eagle Center - EAGLE101: PREENING AND WHY IT INDICATES COMFORT If you've ever closely watched birds, no doubt you've seen them spend some moments dutifully adjusting their feathers one by one