"The Gorilla Foundation is sad to announce the passing of our beloved Koko," the research center says, informing the world about the death of a gorilla who fascinated and elated millions of people ...

SAN FRANCISCO -- Koko the gorilla, whose remarkable sign-language ability and motherly attachment to pet cats helped change the world's views about the intelligence of animals and their capacity for ...

Koko the gorilla doted on her pet kitten as if it were her own child. To the amazement of her human handlers, she seemed able to capture the joys and annoyances of maternal love in strings of simple ...

SAN FRANCISCO (AP) - Koko the gorilla, whose remarkable sign-language ability and motherly attachment to pet cats helped change the world's views about the intelligence of animals and their capacity ...