Smith, David Livingstone, 60

Smuts, Barbara, 55, 143, 158

snake, 18, 60, 116

sociobiology, xi–xiii, 3, 124, 184–185, 190

Somalia, 214

South Africa, 22, 24, 51, 213

South America, 110, 156, 163, 195

South Dakota, 196

South Korea, 117

Southeast Asia, 128, 187, 257

sparrow, 204–205, 218

sperm competition, 103–104, 122, 167–168

spider monkey, 91, 103, 126, 156, 163–165, 207

squirrel, 102, 113, 195, 218

Stanford, Craig, 59

Stein, David, 124, 133, 184

Strier, Karen, 156, 165

Strum, Shirley, 4, 56

stumptail macaque, 125

Sudan, 27, 214

Sugiyama, Yukimaru, 183

Sumatra, 117

Sussman, Robert, xiii, 59, 87

Syria, 138

Taï National Forest, 155

tamarin, 113–115, 218

Takahata, Yukio, 144

Tanner, Nancy Makepeace, 57

Tanzania, 6–7, 52, 57, 67, 70–75, 158, 173–174, 184, 195

Tarsier, 110

Tennessee, 47

testes, 33, 103–104, 110

testosterone, 33–35, 39, 94, 137

Thailand, 119

Tibetan macaque, 90, 94, 99–101, 129, 162

Tierney, Patrick, 58

tiger, 55, 60, 85

Tiger, Lionel, 55

Tikal National Park, 165

Tikopia people, 137

titi monkey, 110

Transvaal, 51

Treves, Adrian, 188

Turkey, 214

Turnbull, Colin, 54

Uganda, 70, 75, 150, 171, 214

United Nations, 62, 213

United States, 47, 118

University of California, 50

Valero, Helena, 58

Vedder, Amy, 136, 148

Zhou, Jiang, 121