Best .... Selfie ... Ever.
Thank you Koko ( July 4, 1971 – June 19, 2018 )
Here's a good article that illustrates how Koko and Washoe, and Kanzi have communicated with us:
It's sadder than you think: Koko taught sign language to an older gorilla who had been orphaned as a baby by bush meat hunters. When researchers asked him to to tell them about his mother, he described her being shot and her throat cut, and his sorrow at seeing this.
“Michael, a gorilla who knew sign language, described his mother being shot as he watched.” [elephantjournal.com]