A series of experiments demonstrated that African grey parrots had something like social intelligence in addition to their cleverness.
From the very first trial, which was described Thursday （Jan. 9） in the journal Current Biology, the parrots with tokens gave them away to its neighboring parrot, even though they got nothing in return. They’re the first non-mammals observed helping each other in this way. Dr. Brucks had trained the parrots to exchange metal tokens for walnuts.
Dr. Brucks tried the experiment on eight African grey parrots. The researchers found that pairs with closer relationships before the experiment were more likely to help one another. And the parrots also helped others they weren’t as close with.
When the researchers repeated the experiment with blue-headed macaws, another type of parrot, the birds only acted selfishly. The researchers think different social systems in the wild may help explain the different results.
parrot：名詞，鸚鵡。例句：The team would now like to investigate how widespread cooperation is among the world’s 393 parrot species.（該團隊現在希望研究全球393種鸚鵡在互助行為的普遍性。）
African grey：鳥類名稱，非洲灰鸚鵡。例句：African greys live in huge, constantly shifting flocks.（非洲灰鸚鵡生活在變動性高的龐大鳥群之中。）
Macaw：鳥類名稱，金剛鸚鵡。例句：Blue-headed macaws live in smaller, unchanging groups.（藍頭金剛鸚鵡生活在不變動的較小群體當中。）