Contemporary farms are facing challenges in concealing a secret. In the United States, the majority of animals destined for consumption are bred in enormous, peculiar facilities, tucked away in isolated rural locations. Mark Devries, the director of “Speciesism: The Movie,” embarked on a mission to explore this issue. The documentary guides audiences on a journey that is at times humorous and at times alarming, as it navigates through the underbrush concealing these factories, soars above their hazardous waste lagoons, and confronts the proprietors directly.