But perhaps no animal has done more to upend conventional notions than Alex, an Africangray parrot.
但是，或许没有其它动物比alex，一只非洲灰鹦鹉，更加颠覆了传统观念。
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Asian elephants are gray but darker than their African Cousins. Most African elephants have tusks, ears, and a trunk bigger than the Asian elephants have.
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.