...)，亚马逊(Amazons),锥尾 鹦哥 ( Conures ),白腹凯克(White Billed Caiques),小品脱鹦鹉(Parrotlets),非洲灰鹦鹉(African Greys),牡丹鹦鹉(Lovebirds),环颈小鹦鹉(Ring Nec..
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Feather picking in African greys may be linked to a deficiency of the amino acid arginine, and the presence of red feathers where gray ones would normally appear may be due to a deficiency of lysine.
缺乏氨基酸精氨酸可能导致拔毛，而红色羽毛的出现可能因为缺乏赖氨酸。
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African greys are not classified as an endangered species - but they can only be traded under strict conditions.
BBC: Parrots start disappearing around the time of the Hajj
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