Koko was best known for her seemingly-innate ability to communicate with her handlers using American sign language, but she also served as an important symbol for a species recognized by the ...

American Sign Language (ASL) has helped people communicate who aredeaf and hard of hearing and it is also helping socialize a homeless, deaf dog named Ludwig. Deaf dog goes through agility ...

I know that gorillas and chimpanzees can learn sign language and use it to communicate. But can other animals use sign language, too?

Koko, whose extraordinary ability to communicate with humans and aptitude with American Sign Language helped show the world the emotional depth and intelligence of animals, died in her sleep this ...