Long before my wife Claudia and I had our son, Rupert, 16 months ago, we’d already discussed the importance of bringing him up with both speech and sign language from birth (should he be born hearing) ...

The gorilla knows over 1,000 words in sign language. — -- A gorilla famed for its ability to converse in sign language is now a mother after "adopting" two adorable kittens. Koko the gorilla ...