Hello I have to little cockatiels and I am a bit worried because the other day my bird apparently got frightened and started flapping his wings (barely does this) but this is the second time when he hurts his wing but this time he bled and he didn't bleed too much but his wing is stained but today he flapped again and we tried to check his wing without hurting it and it was still stained and when he preens the little dust comes out stained.Is this bad or ok I dont know and any help is appreciated.
Again Thanks