Test Your Knowledge
Without hesitation, Alex’s beak opened: “Co-lor.”
“What’s different?” Pepperberg asked.
“Shape,” Alex said. Since he lacked lips and only slightly opened his beak to reply, the words seemed to come from the air around him, as if a ventriloquist were speaking. But the words—and what can only be called the thoughts—were entirely his.
Prior to Pepperberg’s study, scientists believed that birds could not learn to label objects. Assigning labels to items was something that only humans could do, linguists such as Noam Chomsky had argued in the 1960s. Scientists were also certain that birds could not understand concepts such as “same” and “different,” or “bigger” and “smaller.” Yet for the next 20 minutes, Alex ran through his tests, uttering the labels for a range of items (key, cup, paper) and distinguishing colors, shapes, sizes, and materials (wool versus wood versus metal) of various objects. The concept of “same/different” is considered cognitively demanding. It required Alex to pay attention to the attributes of the two objects and to understand exactly what Pepperberg was asking him to compare—their color, shape, or material. He had to make a mental judgment and then vocally give her the answer, using the correct label.
Next, she and Alex moved on to some simple arithmetic, such as counting the yellow toy blocks among a pile of mixed hues. Animals’ ability to count is a much debated subject, but Alex seemed able to do this (and Pepperberg had published several papers attesting to his skill). He even understood the concept of zero, or none, as he called it—again, the only animal, other than two chimpanzees, so far known with this ability.
And, then, as if to offer final proof of the mind inside his bird brain, Alex spoke up. “Talk clearly!” he commanded, when one of the younger birds Pepperberg was teaching mispronounced the word green. “Talk clearly!”
“Don’t be a smart aleck,” Pepperberg said, shaking her head at him. “He knows all this, and he gets bored, so he interrupts the others, or he gives the wrong answer just to be obstinate. At this stage, he’s like a teenage son; he’s moody, and I’m never sure what he’ll do.”
“Wanna go tree,” Alex said in a tiny voice.