And here another curious fact must be noted: the most dangerous assailants to the safety of the nursery are his own wives; these unnatural mothers would, if they were permitted, devour every single egg. Is it this conduct of the female sticklebacks that explains the devotion of the male? Again I do not know. Certain it is, however, that the safety and care of the young is the stickleback father’s constant occupation—the duty to which he sacrifices his life. From time to time he changes the position of the eggs; he is a master in sanitation and keeps them constantly bathed with fresh water. This he does by driving a stream through the nest by means of a fanning motion of his breast, fins and tail. Through all the hatching period he works with unceasing care. When at length the fry are born, the father’s vigilance is even further taxed. The children, vigorous and venturesome, have to be watched by day and by night and protected. Around and across and in every direction the father, as guardsman, continually swims. He drives off all comers with splendid courage. On one occasion a stickleback father was watched while his nest was attacked by two tench and a golden carp; he seized their fins and struck with all his might at their heads and eyes. Truly the stickleback’s care of his children is extraordinary. His vigilant eye is everywhere. If any members of the young brood stray too far from the nest for safety, he immediately swims after them, seizes them in his mouth, and brings them back to the safe playwater in the vicinity of the nursery. This continuous watchfulness lasts for about six days after the hatching.[22] Well, what do you think now of the common view of the parental instinct being stronger always in the mother than in the father? Have we not been taking too much for granted and accepting theory for truth? In the light of our knowledge gained from these examples of the father’s extreme devotion, it seems impossible to refrain from thinking that the most intelligent and fit parent is the one who cares for the young. No doubt it is difficult, or even impossible, to decide the circumstances that have contributed to this strange result of the father taking the mother’s place in the family. We do not know whether these acts of his sacrifice to the children’s welfare imply the presence of the mind element—that is, whether they can be regarded as conscious as distinguished from unconscious adaptation, but this is altogether a separate matter and has nothing to do with the question we are considering. Fish display, according to Romanes,[23] emotions of fear, pugnacity, social, sexual and parental feelings, anger, jealousy, play and curiosity. Such emotions, he states, correspond with those that are distinctive of the psychology of a child of about four months.