XXIII.  Shall I reckon up for you the differences of the other animals, both from us and from each other,—differences of nature, and of production, and of nourishment, and of region, and of temper, and as it were of social life?  How is it that some are gregarious and others solitary, some herbivorous and others carnivorous, some fierce and others tame, some fond of man and domesticated, others untamable and free?  And some we might call bordering on reason and power of learning, while others are altogether destitute of reason, and incapable of being taught.  Some with fuller senses, others with less; some immovable, and some with the power of walking, and some very swift, and some very slow; some surpassing in size or beauty, or in one or other of these respects; others very small or very ugly, or both; some strong, others weak, some apt at self-defence, others timid and crafty The Benedictines here insert Some well protected; but it is their own conjecture, and is not found in the Manuscripts. and others again are unguarded.  Some are laborious and thrifty, others altogether idle and improvident.  And before we come to such points as these, how is it that some are crawling things, and others upright; some attached to one spot, some amphibious; some delight in beauty and others are unadorned; some are married and some single; some temperate and others intemperate; some have numerous offspring and others not; some are long-lived and others have but short lives?  It would be a weary discourse to go through all the details.