As this article shows that scientists taught other animals to converse with signs, but Koko was the first gorilla who has done this. Moreover, she behaves like a good friend. She tried to help her fellow friends, for instance, if she saw the horse having the bit in his mouth then she knew that he is sad. So, for making others understand that the horse is sad, she showed her teeth as everyone knew that
As this article shows that scientists taught other animals to converse with signs, but Koko was the first gorilla who has done this. Moreover, she behaves like a good friend. She tried to help her fellow friends, for instance, if she saw the horse having the bit in his mouth then she knew that he is sad. So, for making others understand that the horse is sad, she showed her teeth as everyone knew that