The scientist draws very interesting analogies between the behavior of different vertebrate species and Homo sapiens behavior, which is why the book was published in the “Library of Foreign Psychology” series. Claiming that aggressiveness is an innate, instinctively determined property all higher animals, and proving this with plenty of convincing examples, the author comes to the conclusion: “There are good reasons to consider intraspecific aggression is the most serious danger facing humanity in modern conditions of cultural, historical and technical development.”