Project Nim is a very intriguing 2011 documentary about a chimpanzee that was taken from its mother when it was two weeks old (in the early 1970's), and then raised with humans and taught sign language. On the movie website rottentomatoes.com it received a 98% positive rating from critics, and I thoroughly enjoyed watching it and would recommend it to others. There are 122 reviews and 119 are positive:
Project Nim - Rotten Tomatoes
Project Nim - Rotten Tomatoes