Most people have heard of Koko, the Stanford-educated gorilla who could speak about 1000 words in American Sign Language, and understand about 2000 in English. Koko was an avid fan of Mister Rogers’ Neighborhood. Esquire reported that when Fred Rogers took a trip to meet Koko for his show, not only did she immediately wrap her arms around him and embrace him, she did what she’d always seen him do onscreen: she took his shoes off. [Mr. Rogers brought a stuffed Daniel Tiger as a hostess gift.]