The Lac humanum type dreams of a variety of animals, especially of amphibious creatures. This is perhaps suggestive of the notion that monotremes (of which our Australian platypus is an example) provide an evolutionary link between reptiles that lay eggs and abandon their young, and mammals that birth live and suckle their young.
As a species we are defined by our ability to nourish our young in this special way. That this ability evolved is perhaps due to the willingness of an amphibious creature millions of years ago to allow her young to lick the sweat from her chest, thereby increasing their chance of survival to reproduce in an adaptive manner. Sweat, like saliva, is rich in lysozyme, an enzyme with potent anti-bactericidal properties from which, α-lactalbumin, the main protein in human milk, is derived. (1) Milk, a unique substance, which varies slightly from specie to specie in the mammalian kingdom, affords all newborns an increased chance of survival due to a range of protective and potentiating characteristics, which will be explored in depth in this book.”