Anytime a feather falls out you will see a pin feather where the new one is growing in. Molts range from minor to severe, 5-10 pin feathers is minor, during a more severe molt you will see many feathers lost and the bird may become more quiet and lethargic than normal and can also become crabby. During this time it is best not to encourage activity, let the bird decide how much activity he feels like doing. Providing hard boiled egg or commercially prepared egg food will help with the protein requirements during the molt. I grate the white of a hard boiled egg and they all love it.