A 2005 study revealed an African grey parrot named Alex understood an empty set. Alex could apply the label 'none' to absent object categories. This parrot had previously learned to identify objects, ...

Alex the African gray parrot could do more than speak and understand he could also count, identify colors and develop an emotional relationship.... 'Alex & Me': The Parrot Who Said 'I Love You' It's ...

WALTHAM, Mass. -- Alex, a parrot that could count to six, identify colors and even express frustration with repetitive scientific trials, has died after 30 years of helping researchers better ...

In three decades as a research subject, Alex the parrot dazzled the world with his ability to talk, count and identify colors and shapes, along the way providing scientists with unprecedented insights ...

WALTHAM, Mass. (AP)-- Alex, a parrot who could count to six, identify colors and even express frustration with repetitive scientific trials, has died after 30 years of helping researchers better ...

Alex is the African gray parrot whose ability to master a vocabulary of more than 100 words and answer questions about the color, shape and number of objects—garnered wide notice during his life as ...

Alex, as adult readers may recall, was indeed no ordinary bird: for 30 years, this African grey parrot, purchased in a pet shop, was the research subject of animal psychologist Irene Pepperberg, who ...

WALTHAM, Mass. - Alex, a parrot who could count to 6, identify colors and even express frustration with repetitive scientific trials, has died after 30 years of helping researchers better understand ...