Toes...what's up with toes? When our fishy ancestors invaded the land, "air-breathing lungs and legs with digits (both of which seem to have evolved originally for use in water) were probably first of use to them when they still lived in shallow lagoons, marshes, and other wetlands, and had to wriggle through wet vegetation and survive in temporarily stagnant water. Their legs and lungs...started out as means of preserving their basically aquatic status quo, and only later proved useful for life truly on dry land." Evolution and human behavior, in Original Selfishness: Original Sin and Evil in the Light of Evolution, Daryl Domning and Monika Hellwig, 2006.