Hitler's Mein Kampf

“Every animal mates only with a member of the same species” (390). This observation made in Mein Kampf was what Adolf Hitler believed to be one of the most fundamental principles of Nature’s rule. He illustrates this with examples, “the titmouse seeks the titmouse, the finch the finch, the stork the stork, the field mouse the field mouse, the dormouse the dormouse, the wolf the she-wolf, etc.” (390). Hitler understands this to be “Nature’s restricted form of propagation” (390) and only exceptional circumstances, such as captivity, can disrupt this mating pattern. Mating outside of your own species – or at a different level – results in serious consequences: infertility of later offspring and decreased immunity to illness and attacks.
The daily struggle to survive is described by Hitler as a tool to ensure that the healthy and strong survive and those who are weak or sick succumb. Hitler explains that this results in higher development for the species: imp...