Dr. Sue says she taught Kanzi to communicate the same way she taught her son to speak. "I just talk to Kanzi like you see me talking now," she says. "He just was around me and learned it like a child."

Lisa says it was fascinating to watch Sue communicate with Kanzi at the Great Ape Trust. "It was very apparent that Kanzi was understanding what she said," she says.

In addition to speaking through lexigrams, Kanzi has another remarkable ability—he can blow up a balloon. While this may not seem like a groundbreaking development, Sue says it's a huge step. "Humans are said to be the only species that have control of their own breath," she says. "But Kanzi obviously has control of his own breath."


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