Human-animal relationships History 172 Social aspects 144 Animals 128 Animals and civilization 122 Dogs 120 Animal welfare 113 more ... Behavior 76 Moral and ethical aspects 74 Philosophy 48 Symbolic aspects 46 Psychological aspects 45 Animal rights 44 Pets 42 Effect of human beings on 41 Psychology 40 Animals (Philosophy) 32 Nature 30 Human ecology 29 Animals in literature 28 Animal behavior 26 Therapeutic use 26 Dog owners 25 Conservation 24 Social life and customs 23 Cats 20 Religious aspects 20 Domestication 18 Ecology 18 Human-plant relationships 16 less ...