[BabyPeanut]

http://www.world-science.net/exclusives ... erofrm.htm
$this->bbcode_second_pass_quote('', ' ')The story began when researchers started testing Alex to see whether he understood small numbers, between one and six. Zero wasn’t expected of him. The researchers would lay out an array of objects of different colors and sizes, and asked questions such as “what color four?”— meaning which color are the objects of which there are four.

Alex performed well on this, with no training, for dozens of trials, the researchers recounted. But then he balked. Alex started ignoring questions, or giving wrong answers, seemingly deliberately. He seemed to enjoy the experimenters’ frustrated reactions, they said.

There was evidence, they added, that his stubbornness stemmed from boredom with the rewards he had been getting for right answers. The researchers found some more interesting toys to give as rewards. After two weeks of obstructionism, Alex grudgingly returned to the game, though he occasionally seemed to lapse back.

One of these apparent lapses occurred one day when an experimenter asked Alex “what color three?” Laid out before Alex were sets of two, three and six objects, each set differently colored.

Alex insisted on responding: “five.” This made no sense given that the answer was supposed to be a color.

After several tries the experimenter gave up and said: “OK, Alex, tell me: what color five?”

“None,” the bird replied. This was correct, in that there was no color that graced exactly five of the objects. The researchers went on to incorporate “none” into future trials, and Alex consistently used the word correctly, they said.

[Petro]

I have a Macaw, and although no scientific study to back it up believe me these creatures are frighteningly intelligent!