Mein Kampf has very interesting parts about reproductivity of animals. Statements such as
“the stork goes to the female stork, field mouse to field mouse, house mouse to house mouse, wolf to wolf, etc…”
are truly remarkable in his incomprehensibly big brain revelations about biology. Then he moves on to explain how the same would apply to humans, completely brushing over the fact that storks and mouse are different kinds and he is too stupid to differentiate between race and kind.