Emily Barwick of Bite Size Vegan produces wonderful, educational videos on animals rights. Her attention to detail in all of her videos is unmatched. Yet, she still outdid herself with this 23-minute video on THE HISTORY of vegetarianism, veganism and animal rights:
http://youtu.be/BXlR8if5hok?list=PLmIqdlomtuStFtMawXWLcH9Ia2TFFkDZ3
IT IS A MUST WATCH. Honestly, it is one of the best videos on animal rights that I have ever seen.