A gentle gorilla who famously mastered sign language and understood 2,000 words has sadly passed away.
Scientists have found evidence to suggest that some fish can use a form of rudimentary sign language.
Two sophomore students have invented gloves that can turn American Sign Language in to spoken words.
A gorilla who can speak sign language has appeared in a new video to raise awareness for climate change.
Is it possible for apes to speak English like in the new 'Dawn of the Planet of the Apes' movie ?
Sign language gestures used by our primate cousins have been documented in full for the first time.