publication date: Tuesday, April 3, 2018 (part of Spring 2018)
clue: She is said to have learned over 2000 words of human language, even simple words like "cat."
explanation: Koko is a gorilla who has learned to interact with scientists through sign language and to respond to their spoken words. She famously adopted her first of several kittens in 1984, attracting national attention. more…