Kanzi the Bonobo, a remarkable ape known for his ability to communicate with humans using symbols and make stone tools, passed away at the age of 44. Throughout his life, Kanzi was the subject of numerous studies that aimed to shed light on ape cognition and the origins of human language and tool use.
Kanzi’s unique talent set him apart from other great apes who had also learned to communicate with humans using signs or symbols. Unlike his predecessors, who were directly trained by researchers, Kanzi developed an interest in symbols on his own while observing his adoptive mother, Matata, receiving lessons on keyboard lexigrams. Over time, Kanzi learned hundreds of symbols representing objects, activities, and abstract concepts, sometimes even creating new meanings by combining these symbols.
In addition to his linguistic abilities, Kanzi also displayed impressive technological skills. With the help of archaeologists Nicholas Toth and Kathy Schick, Kanzi learned how to make stone tools by using one rock as a hammerstone to remove sharp flakes from another rock called a core. He even invented his own technique of throwing a flint cobble against a hard tile floor to remove larger flakes, which he then used to cut a cord to open a box with a food treat inside.
Despite his ingenuity, Kanzi’s toolmaking skills fell short of those of modern humans and our ancestors. Comparisons with human ancestors who lived 2.6 million years ago revealed that Kanzi’s attempts at flaking were less successful, with smaller flakes being produced. Toth and Schick attributed these limitations to biomechanical and cognitive factors, emphasizing the importance of recognizing acute angles and striking with precision to successfully remove flakes.
Renowned primatologist Jill Pruetz shared fond memories of Kanzi, recounting interactions where she held conversations with him via symbol boards and even played chase. One amusing anecdote involved Kanzi using symbols to describe a frightening beaver in his habitat, combining the symbols for ‘water’ and ‘gorilla’ to convey his fear.
Born in 1980, Kanzi spent much of his life in various research facilities before his passing in 2025. Despite facing challenges such as the closure of the Great Ape Trust in Iowa, where he and his sister Panbanisha resided, Kanzi continued to captivate researchers and the public with his intelligence and abilities. His unexpected death on March 18, 2025, left many saddened, with the cause still unknown pending necropsy results. Kanzi’s legacy as a pioneering bonobo who pushed the boundaries of ape cognition and communication will be remembered for years to come.
