DOMESTICATED ANIMALS 



53 



vented from doing so by the father. In very few 

 species of fishes do the females care anything for 

 either the eggs or young. Among fishes, there- 

 fore, the instinct to save the young is not the won- 



THE STICKLEBACK FATHER GUARDING HIS NEST 



derful "mother instinct" found in the human and 

 other higher species, but the father instinct. 



Among all animals that mate for life, birds and 

 men alike, parental love is more evenly divided be- 

 tween the two sexes than it is among those races 



