Everything about the Koko the gorilla sign-language story was total bullshit
(bigthink.com)https://bigthink.com/life/ape-sign-language/Koko's last sign-language message was "help and protect the earth". The one before that was presumably "please keep funding sign-language studies for apes". Your Bullshit-o-meter should be at 11.
Edit: At the time, I believed the story. It didn't seem impossible. I didn't think everyone would collude to just make that shit up. Then I recently read about Koko's last "message to humanity" was to save/fix the planet. Umm...there is no way that was true. And it wasn't!
