Register for an account


Enter your name and email address below.

Your email address is used to log in and will not be shared or sold. Read our privacy policy.


Website access code

Enter your access code into the form field below.

If you are a Zinio, Nook, Kindle, Apple, or Google Play subscriber, you can enter your website access code to gain subscriber access. Your website access code is located in the upper right corner of the Table of Contents page of your digital edition.

Planet Earth

In Memoriam: Koko the Gorilla

The sign-language-speaking ape passed away this year.

By Mark BarnaJanuary 1, 2019 6:00 PM
Koko and Kitten - The Gorilla Foundation
(Credit: Ron Cohn/The Gorilla Foundation/


Sign up for our email newsletter for the latest science news

For more than four decades, Koko the gorilla and her American Sign Language (ASL) skills captured the public’s attention. Born in 1971 at the San Francisco Zoo, the western lowland gorilla began learning ASL the following year from Penny Patterson, then a graduate student in psychology. Koko, shown here holding All Ball, a kitten she named herself, raised awareness of her critically endangered species through frequent media appearances, and reshaped attitudes about animal intelligence. She died in her sleep on June 19, at age 46.

2 Free Articles Left

Want it all? Get unlimited access when you subscribe.


Already a subscriber? Register or Log In

Want unlimited access?

Subscribe today and save 70%


Already a subscriber? Register or Log In