Watched this on Netflix "Watch Instantly". There were many amazing scenes, including
a) A male gorilla describing (using sign language) how his mom was shot when he was an infant.
b) Koko selecting a mate through video dating. She was very clear about who she liked and didn't. When she found her favorite, she asked her trainer to bring him to her.
c) Koko painting a picture of her favorite dog -- deliberately selecting only black and white from a palette of 5-10 other colors.

Quoted: Narrated by Martin Sheen, this installment of the Emmy award-winning PBS series Nature features the story of the famous gorilla named Koko. Collecting conversations -- in which Koko "spoke" via sign language -- from a decades-long dialogue with the ape, this program details the wants and needs expressed by Koko and her complexity and creativity.