Fernando López-Mirones, who wrote and directed this film, opens with a thought experiment: if an alien zoologist studied humans the way we study other species, what would it conclude from our behavior? His answer is that Homo sapiens sapiens remains, underneath the suits and technology, a primate still driven by the same instincts that shaped smaller-brained ancestors. The film argues that this genetic legacy now works against us, pointing to overpopulation and the energy consumption behind climate change as symptoms of appetites we never evolved to restrain. Biologists, anthropologists, and environmental scientists appear on camera to back the case, tracing a line from the Industrial Revolution's promise of progress to a present the film frames as self-inflicted crisis. There is no wildlife footage or field investigation here; the argument is delivered mostly through interview and narration, treating humanity itself as the animal under observation. The title's premise, that the modern professional class is still a tribe of animals, is the film's throughline from start to finish.