How many sign language signs koko learned?

Koko, the famous gorilla who learned sign language, was reported to have learned over 1,000 signs.

However, it's important to note that the exact number is debated and there's no single, universally accepted figure.

Some researchers believe Koko learned and understood even more signs than this, while others argue that the number is inflated and that some of her "signs" might have been misinterpretations by her trainers.

Regardless of the exact number, Koko's ability to communicate using sign language was groundbreaking and helped to change our understanding of animal communication.