Because they share 98.8 percent of our DNA, chimps have long been used as "ideal" models to test drugs and vaccines.
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: