Koko was a famous gorilla known for her ability to communicate using sign language. Born in 1971, she was raised in captivity and learned over 1,000 signs, allowing her to express her thoughts and feelings to her caregivers. Koko's intelligence and emotional depth fascinated both scientists and the public. Koko lived at the San Francisco Zoo and was part of a research project led by Dr. Francine Patterson. She became a symbol of the potential for interspecies communication and raised awareness about the intelligence of great apes. Koko passed away in 2018, leaving a lasting legacy in animal research.