Alex the African Grey Parrot: The Bird Who Learned to Talk, Count, and Say "I Love You"
Some pets become famous because of their funny habits. Others become famous because they helped people see the animal world differently.
Alex was one of those animals.
For about 30 years, this African grey parrot worked with animal cognition scientist Dr. Irene Pepperberg. He learned to label objects, identify colors and shapes, count small groups of items, compare sizes, recognize materials, and use the word “none” to describe absence.
He also had a big personality, a mischievous streak, and a touching relationship with the people around him. By the time he died in 2007, Alex had become one of the most famous animals in history, and one of the most influential celebrity pets in science.
From a Chicago pet shop to a groundbreaking laboratory
Alex was bought from a pet shop in Chicago in 1977, when he was about 12 or 13 months old. Dr. Irene Pepperberg chose him for a research project that would explore how birds learn and communicate.
His name came from the project’s title: Avian Learning EXperiment, or A.L.E.X.
At the time, many people assumed that a talking parrot was simply copying sounds. Parrots can imitate human speech remarkably well, but imitation alone does not necessarily mean understanding. Pepperberg wanted to find out whether Alex could use vocal labels with meaning.
The project continued through several universities and research settings, including the University of Arizona, Harvard, and Brandeis University. Over the decades, Alex became Pepperberg’s research partner as well as her companion.
That partnership changed the way scientists thought about bird intelligence.
What could Alex actually say?
Alex learned more than 100 vocal labels. He could use words for objects, colors, shapes, materials, actions, and quantities.
Researchers had reliable data on about:
50 different object labels
7 colors
5 shapes
Quantities up to at least six, with work continuing on seven and eight
He could answer questions such as “What color?” and “What shape?” He could request items, refuse things he did not want, and describe objects.
For example, if he saw differently colored blocks, he could identify a “green block” or a “yellow block.” He could also recognize that two objects were the same or different, and that one item was bigger or smaller than another.
These were not just simple words repeated on cue. Alex used combinations of labels to communicate more specific information.
One of the most charming examples was his word “banerry.” When he encountered an apple, he reportedly combined “banana” and “cherry” to create a new label. The apple may have reminded him of a cherry on the outside and a banana on the inside.
Whether “banerry” was a deliberate blend in the same way a human might invent a word is impossible to know for certain. Still, it showed that Alex was doing something more flexible than repeating a memorized sound.
The bird who could count
Alex’s number skills became some of his most famous abilities.
He learned to count sets of objects, often up to six. If researchers placed different numbers of items on a tray, Alex could answer questions about how many were present. He could also connect spoken number words with groups of objects and, in some studies, with written numerals.
The objects could be mixed together by color or material. That meant Alex had to pay attention to quantity rather than simply choosing the group that looked alike.
He also learned to identify materials, including:
Wool
Wood
Cork
Paper
A researcher could ask what an object was made of, and Alex could provide the appropriate label.
These are the kinds of amazing animal facts that made his work so exciting. Alex was not performing a magic trick. He was taking part in carefully designed experiments about categories, quantities, and relationships.
“None” and the idea of zero
One of Alex’s most important achievements involved a word that sounds very simple: “none.”
In a 2005 study, Alex used “none” when there was no difference between two objects. For example, if he was asked what was the same or different and no relevant difference existed, he could respond with “none.”
Researchers then observed him applying the idea more broadly.
When shown groups of objects and asked a question involving a number that was not present, Alex could eventually answer “none.” In other words, he was responding to the absence of a quantity. A zero-like concept.
This mattered because recognizing that “nothing” is itself an answer is a more advanced idea than simply naming one, two, or three objects. The finding was widely reported as evidence that Alex understood something close to zero or the null set.
The result did not mean Alex had human mathematics. It did suggest that a bird could form and use an abstract concept that researchers once believed was beyond the abilities of parrots.
How Pepperberg made sure Alex was not just guessing
Pepperberg was careful about the methods used in Alex’s training.
Alex was not kept hungry or trained through food deprivation. He worked for things he enjoyed, including toys, praise, attention, play, and occasional treats. Often, the best reward was the object itself: a piece of wood to chew, a key chain to play with, or a favorite toy.
Pepperberg used a technique called the model/rival method. Two people would interact while Alex watched. One person acted as the trainer, while the other modeled an answer and competed with the bird for attention and rewards.
Sometimes the model gave a wrong answer and was corrected. Sometimes the roles were switched. Alex saw that communication was a social exchange, not just a button-pressing exercise.
He also competed with two other parrots, Griffin and Arthur, for the attention of the researchers. This social setup helped keep Alex engaged and gave him a reason to participate.
Most importantly, Pepperberg stressed that the researchers were not secretly giving Alex the answers through gestures, facial expressions, or other cues. The experiments were designed to reduce the chance that he was simply responding to unconscious prompting.
Was Alex using human language?
This question requires some care.
Alex could use human speech sounds in meaningful ways, but Pepperberg pushed back against the idea that he had human language in the full sense. He did not speak with human grammar, tell complex stories, or hold conversations like a person.
Instead, he used a vocal communication system that allowed him to label, request, categorize, compare, and answer questions.
Popular descriptions often compared Alex’s cognitive abilities to those of a young human child: sometimes around five years old for certain reasoning tasks, with language use and emotional behavior compared to a much younger child. These comparisons are useful as rough illustrations, but they do not mean Alex was a feathered five-year-old human.
Alex was a parrot with a parrot’s brain, body, social life, and way of experiencing the world. His achievement was not becoming human. It was showing how impressive a parrot could be on its own terms.
A personality as memorable as his intelligence
Alex was not just a collection of test results.
He could be bossy, playful, impatient, and funny. He sometimes became bored during experiments and made his feelings clear by turning away, throwing objects off the table, or indicating that he wanted to stop.
He also appeared to understand familiar routines. He could ask to go back to his cage, request favorite objects, and use phrases in appropriate situations.
That personality helped people connect with the science. Instead of thinking about animal intelligence as a distant academic subject, people saw an individual bird with preferences, moods, and relationships.
Alex became a symbol of the idea that animals may understand far more than we realize, especially when researchers take the time to communicate with them in ways that fit their abilities.
Alex’s sudden death in 2007
On September 6, 2007, Alex died suddenly at the age of 31.
His death was a shock. African grey parrots can live for 50 years or more, and Alex had recently appeared healthy. According to the Alex Foundation’s pathology report, he suffered a sudden fatal cardiac arrhythmia. There was no way to predict it, and he died quickly without prolonged suffering.
The news spread around the world. Newspapers, television programs, science magazines, and animal lovers all mourned him.
The night before his death, Alex and Pepperberg shared the exchange that would become part of his lasting story.
Pepperberg told him, “You be good. I love you.”
Alex replied, “See you tomorrow.”
It was a simple goodbye, but to the people who knew him, it carried enormous emotional weight.
Alex’s lasting legacy
Alex’s work helped remove “birdbrain” from the list of insults people could use without thinking. He showed that a bird with a brain very different from ours could reason about objects, categories, quantities, and absence.
His research inspired the Alex Foundation, which continues to support work on avian cognition, communication, and parrot welfare. His fellow parrots, including Griffin and Arthur, also helped carry the research forward.
Alex influenced generations of animal cognition researchers and changed how the public thinks about parrots. He also reminded us that intelligence does not come in just one shape.
Some animals solve problems with their hands. Some use echolocation. Some navigate across oceans. Alex used his beak, his memory, his social intelligence, and a remarkable ability to make sounds that humans could understand.
That is why Alex remains one of the most memorable celebrity pets, and one of the most important famous animals in history.
He taught the world that a parrot could do much more than talk.
A parrot could think, choose, compare, learn, disagree, create new labels, and build a meaningful relationship with the people around him.
And, in the end, he left everyone with a goodbye they would never forget.
Sonny’s publish-day social feature
Publish day: Monday, September 28, 2026
Platform: Instagram and Facebook
Creative: Use the warm memorial image below as the social image, with the headline overlay: “Alex the Parrot Who Changed What We Believe About Bird Intelligence”
Caption:
Alex was not just a talking parrot.
Over 30 years of research, he learned more than 100 labels, counted objects, recognized colors and materials, understood “same” and “different,” and used the word “none” to describe absence.
He even created the word “banerry” for an apple. 🍎
Alex died suddenly on September 6, 2007, at age 31, but his work continues to influence animal cognition research around the world.
Read the full story of this remarkable African grey parrot on the Famous Pets blog.
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