Now, this sense of the presence of other living beings is very well developed in the lower animals, particularly in those whose safety depends upon the knowledge of the presence of their natural enemies. As might be expected, the wild animals have it more highly developed than do the domesticated animals. But even among the latter, we find instances of this sense being in active use--in the case of dogs, horses, geese, etc., especially. Who of us is not familiar with the strange actions of the dog, or the horse, when the animal senses the unseen and unheard presence of some person or animal? Very often we would scold or punish the animal for its peculiar actions, simply because we are not able to see what is worrying it. How often does the dog start suddenly, and bristle up its hair, when nothing is in sight, or within hearing distance. How often does the horse grow "skittish," or even panicky, when there is nothing within sight or hearing. Domestic fowls, especially geese, manifest an uneasiness at the presence of strange persons or animals, though they may not be able to see or hear them. It is a matter of history that this sense, in a flock of geese, once saved ancient Rome from an attack of the enemy. The night was dark and stormy, and the trained eyesight and keen hearing of the Roman outposts failed to reveal the approach of the enemy. But, the keen sense of the geese felt the presence of strange men, and they started to cackle loudly, aroused the guard, and Rome was saved. Skeptical persons have sought to explain this historical case by the theory that the geese heard the approaching enemy. But this explanation will not serve, for the Roman soldiers were marching about on their posts and guard-duty, and the geese remained silent until they sensed the approach of the small number of the enemy's scouts, when they burst into wild cries. The ancient Romans, themselves, were under no illusion about the matter--they recognized the existence of some unusual power in the geese, and they gave the animals the full credit therefor.