But, in the United States last fall, chimpanzees were listed as an endangered species, bringing experimentation on them to an end. And they are having their day in the sun with a new documentary that illuminates their plight.
Sadly, though, there are still hundreds living in labs, waiting to be officially retired to a sanctuary.
If you'd like to help former lab chimps live a better life, you can donate here or here.
Watch the full video, in which Koebner also says goodbye to a chimp friend for the last time, here: