非洲灰鸚鵡是社會關係最複雜的鳥類之一,也由於「能言善道」成為熱門寵物。PHOTOGRAPH BY JOEL SARTORE, NATIONAL GEOGRAPHIC PHOTO ARK
非洲灰鸚鵡尼基(Nikki)與傑克(Jack)在實驗期間交換代幣。PHOTOGRAPH BY ANASTASIA KRASHENINNIKOVA
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