Who is Koko?
Koko the gorilla was truly one of a kind. Throughout her remarkable life, she captured the hearts of countless people, beginning with her devoted handler, Evelyn, and fascinated the world with her extraordinary use of sign language. However, just a few years before her passing, Koko delivered a mysterious message that left many people questioning not only its meaning but also the true extent of her remarkable abilities.
Who is Koko?q
Her Communication Style
From a young age, Koko began learning sign language and went on to use it as her primary way of communicating with the people around her. While that may not sound extraordinary at first, what made Koko truly remarkable was the size of her vocabulary. Over the years, she mastered far more signs than any other gorilla ever documented, demonstrating an unprecedented ability to interact with humans and express her thoughts in ways that continued to amaze researchers and the public alike.
Her Communication Style
Wide Vocabulary
At the height of her abilities, Koko had learned an astonishing 2,000 words, allowing her to communicate with remarkable clarity. She could often express her emotions, preferences, and desires so effectively that there was little doubt about what she was trying to say. This extraordinary skill became especially useful when special occasions rolled around and Koko had the chance to receive gifts, as she could clearly let her caregivers know exactly what she liked and wanted.
Wide Vocabulary
Adored by Everyone
Even after years of working with Koko, Evelyn was often amazed by just how effectively the gorilla could communicate through sign language. Yet she was far from the only person captivated by Koko’s remarkable abilities. Admired by people around the world, Koko became a beloved figure who attracted visitors from all walks of life, including numerous celebrities eager to witness her skills firsthand. Many left deeply moved by their encounters, and for some, the connection they formed with Koko was far more profound than words could ever fully describe.
Adored By Everyone
A Life of Stardom
Koko first rose to fame while still young, giving both her and Evelyn the unexpected chance to meet celebrities they would never have otherwise encountered. Yet Koko herself soon became a celebrity in her own right. She was featured on magazine covers and even appeared in documentaries supporting animal rights and conservation efforts. However, it was her final public appearance that ultimately sparked widespread attention and controversy.
A Life Of Stardom
Heartfelt Words
Over the years, Koko shared many messages—some heartwarming, others playful—but one in particular stood out above the rest. Recorded three years before her death, the message was created for the Paris Climate Summit and was meant to be deeply moving and impactful. While it achieved its emotional intent, it also left many viewers puzzled and raised questions that lingered long after it was seen.
Heartfelt Words
Three Years Prior to Her Demise
The message had such a profound impact that it led some people to question everything they thought they knew about Koko. Recorded three years before her death, it was widely circulated and interpreted in different ways—some accepted it at face value, while others began digging deeper to understand what the beloved gorilla truly meant. Among those who took a closer look was Susan Savage-Rumbaugh, whose findings reportedly left her deeply shocked and raised even more questions than answers.
Three Years Prior To Her Demise
How Did It All Begin?
Koko was born at the San Francisco Zoo in 1971, where she first met Evelyn, and the two would go on to spend 46 years together. When Koko was just one year old, Evelyn began teaching her sign language, and she quickly adapted to the lessons, showing an impressive ability to learn. Within only a few years, she had already mastered her first 1,000 signs, marking the beginning of her extraordinary journey in communication.
How Did It All Begin?
Self-expression
Koko became so proficient in sign language that Evelyn once decided to ask her what she wanted for Christmas. Koko responded that she wanted a cat. However, when Christmas arrived, she was given a doll instead, and Evelyn could immediately tell from her reaction that she was disappointed with the gift. That moment, however, didn’t define the story—because everything changed again when her birthday came.
Self Expression
A Kitten
On her birthday, Koko was given a box filled with kittens and told she could choose one to keep. She picked a gray kitten and named him All Ball. The two quickly formed a close bond, spending much of their time together. Koko was often gentle and nurturing toward All Ball, while the kitten would occasionally push back when he had enough of her attention. Still, their companionship wasn’t always without challenges, and not everything in their relationship went smoothly.
A Kitten
Nearly Human
From Evelyn’s daily observations, Koko often appeared strikingly human in her behavior, a perception that became especially clear during one incident when she damaged a sink in her enclosure and, upon Evelyn’s arrival, appeared to shift blame toward the cat for what had happened. Later, when her kitten companion All Ball died, Koko’s emotional response further underscored just how deeply she seemed capable of forming bonds and expressing grief in ways that closely resembled human behavior.
Nearly Human
A Sad Day
Two years after Koko had been given All Ball, tragedy struck when the kitten was killed in an accident, bringing their close bond to an abrupt end. Evelyn later recalled how deeply distressed Koko became when she was informed of what had happened, and for a brief time she seemed to fall back into more instinctive, animal-like behaviors. She reportedly whimpered and produced the distinctive hooting vocalizations associated with a gorilla in distress, marking a poignant moment that highlighted the depth of her attachment and emotional response.
A Sad Day
One Book
Koko’s relationships with her kittens became so widely recognized that they inspired a book titled Koko’s Kitten, further cementing her place in the public eye. While her story continued to capture attention around the world, many people were surprised to learn that she also had a favorite television personality—Fred Rogers, better known as Mister Rogers. Koko was reportedly fond of watching his show, adding another unexpected layer to her already remarkable and widely discussed life.
One Book
Star Struck
So it was no surprise that Koko was completely starstruck when she finally met her favorite television host, Fred Rogers, in person. She appeared genuinely delighted during the interaction and seemed to enjoy every moment spent with him. However, what many people don’t realize is that another well-known figure also managed to capture Koko’s attention and form a surprisingly close bond with her—leaving fans curious about who this other “star” might have been.
Star Struck
Robin Williams
Koko met Robin Williams in 2001, and the two shared a playful, affectionate interaction that included tickling and even Koko trying on his glasses. Their meeting became one of the most memorable examples of her social engagement with humans. Years later, when Williams passed away in 2016, Koko was reportedly informed of his death and responded with visible sadness, with observers noting her subdued behavior in the aftermath of the news.
Robin Williams
The Death of a Legend
In 2018, 46 years after her birth, Koko passed away, and the world mourned the loss of an animal many had come to admire and feel connected to over the years. The Gorilla Foundation reflected on her legacy, describing her as an ambassador for gorillas and a symbol of interspecies communication and empathy, noting that she had touched the lives of millions and would be deeply missed.
The Death Of A Legend
An Important Message
But before her death, Koko left behind a message that many described as both moving and unsettling, sparking intense discussion around the world. It quickly became the subject of debate and, for some, even years of scrutiny and investigation. Questions began to surface about what she had truly expressed and whether it revealed something deeper about her abilities than previously understood. What exactly was said in that final video—and why did it lead so many to begin reexamining what they thought they knew about her?
An Important Message
Clear-Cuts
After the video circulated, many people began questioning previously accepted ideas about Koko, with some critics raising concerns that appeared, at least to them, worth considering. One of the main points of contention was that the footage was not a single continuous recording of Koko delivering a coherent “speech,” and the organization behind it acknowledged that the material had been edited. Additional skepticism emerged from statements suggesting that certain interpretations of her behavior may have been exaggerated or unlikely, leading some observers to argue that the video did not provide a fully reliable representation of what was being claimed.
Clear Cuts
What If?
Setting aside the speculation and theories, the message associated with Koko still resonated with many people as a powerful reminder of connection and empathy. Even if parts of the video were later questioned or thought to be edited, some viewers felt its broader meaning was not diminished. It encouraged reflection on something fundamental to human existence that is often overlooked, prompting people to consider whether the ideas it raised are worth dismissing entirely or instead taken as a call to think more deeply about our relationship with other beings and the world around us.
What If?
Many Are Skeptical
According to some critics, there is reason for skepticism surrounding how Koko was portrayed in certain media. They argue that her emotional expressions may have been emphasized or framed in ways that increased public interest and viewership. Some primate behavior researchers have also expressed doubt that gorillas can construct complex, sentence-like ideas in the manner suggested by the most interpretive versions of the footage, suggesting instead that such representations may overstate the cognitive abilities being depicted.
Many Are Skeptical
Not Convinced
Some researchers remain unconvinced that Koko was independently producing structured “speech” in sign language. One point raised by critics is that the system she used was a modified form of American Sign Language rather than full, conventional ASL. From that perspective, they argue she may not have truly mastered a human language in the way it is traditionally defined. Others go further, suggesting that gorillas do not acquire sign language in the same linguistic sense that humans do, and therefore caution against interpreting her signs as fully formed language rather than learned communication patterns.
Not Convinced
Theories
Because of these ongoing debates, numerous theories have emerged over the years about how Koko was represented in certain recordings. Some suggest that Evelyn may have guided Koko during filming, subtly prompting or interpreting her signs in real time. Others argue that the video was heavily edited or compiled from different moments to strengthen its emotional impact and deliver a more cohesive narrative. There are also more critical viewpoints claiming that Koko may not have fully understood the meaning behind all the signs she produced, raising further questions about interpretation and intent.
Theories
Was It A Habit?
A particularly interesting theory suggests that the signs used by Koko may have been learned through conditioning and habit rather than full linguistic understanding. According to this view, she was trained to associate specific signs with particular outcomes or rewards. For example, if she learned that a certain sign led to receiving food or attention from her trainers, she might reuse that sign whenever she felt hungry or wanted something, reinforcing the idea that her communication could have been driven more by learned associations than by complex sentence-level intent.
Was It A Habit?
Hard To Believe
But when looking through the many photographs and records collected over the years of Koko, the idea that her communication was purely habitual becomes harder for some people to accept. She was frequently seen displaying a wide range of emotions, from joy and curiosity to sadness and frustration, in ways that appeared responsive to her environment and interactions. Supporters of her abilities argue that she also seemed to understand both signed and spoken communication directed at her, suggesting a level of comprehension that went beyond simple conditioning. This ongoing contrast between skepticism and belief continues to fuel the debate about what Koko truly understood and how her communication should be interpreted.
Hard To Believe
Can’t Prove Anything
In the end, it’s difficult to make definitive claims about whether the video was altered or whether Koko’s abilities were exactly as they appeared in every interpretation. Neither side of the debate can fully prove its case, and much of what has been said remains speculative. While theories and assumptions continue to circulate, they do not necessarily lead to clear answers. What remains undeniable, however, is that perspectives differ, and in complex cases like this, there are often multiple sides to consider rather than a single absolute conclusion.
Can’t Prove Anything
Two Sides To Every Coin
Theories may attempt to challenge interpretations of the video and question Koko’s abilities, but they cannot erase the decades of observations recorded throughout her life. Over the course of 46 years, she remained a unique and widely studied individual whose interactions left a lasting impression on both researchers and the public. In that sense, she stands as something truly one of a kind. Regardless of differing viewpoints, many agree that the broader message associated with her story is worth reflecting on—not only in relation to Koko herself, but also in how we think about communication, empathy, and the future we share.
Two Sides To Every Coin
What Was Said
So what did Koko actually say that sparked so much debate? The message often attributed to her reads: “I am gorilla… I am flowers, animals. I am nature. Man Koko love. Earth Koko love. But man stupid… Stupid! Koko sorry. Koko cry. Time hurry! Fix Earth! Help Earth! Hurry! Protect Earth… Nature see you. Thank you.” It was this emotional and unusual statement that led many to question its interpretation, its context, and even how it was presented, turning it into one of the most widely discussed moments associated with her legacy.
What Was Said
It Seemed Clear
On the surface, the message appears straightforward, but skeptics have long argued that Koko’s signing abilities were limited to the gestures she had been trained to use over the years. From this perspective, her communication may reflect learned sign–response patterns rather than fully structured language. At the same time, others—including researchers like Susan Savage-Rumbaugh—have suggested that there may be deeper layers of cognition and intent behind what was observed, encouraging continued debate over how her behavior should be interpreted.
It Seemed Clear
It Was Eye Opening
The message alone left a strong impression on many people. It raised a simple but uncomfortable question: if Koko could recognize and express concern about the state of the planet, why aren’t humans doing more to address it? For some, it became a call to reflect on environmental responsibility and the urgency of protecting the only home we have. Yet, alongside that emotional response, another question continued to linger—whether there was something more embedded in those words than what appeared on the surface, and what deeper meaning, if any, was being interpreted or projected onto them.
It Was Eye Opening
What Was Hidden In The Words
The Gorilla Foundation later stated that Koko’s central message was clear: that humans are harming the Earth and its diverse plant and animal life, and that urgent action is needed to address the problem. Susan Savage-Rumbaugh has also expressed agreement with this interpretation, viewing Koko’s attempts to communicate such concerns as remarkable. However, some critics argue that the way the material was edited may have diluted or “cheapened” its original intent, adding another layer to the ongoing debate about how her message should be understood.
What Was Hidden In The Words