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"Selfish gene," 2326, 3132

Sex:

as disruptive factor among animals, 7172

Sexual rivalry, 4041

Shelduck, Tadorna tadorna, 29

Shoemaker, Hurst Hugh, 61

Shrike, Yellow-billed, Corvinella corvina, 146

Side-saddle Flower, Sarracenia purpurea, 99

Skutch, Alexander F., 15, 29, 35, 56, 66, 71, 75, 126, 136, 146, 193

Sleeping. See Roosting

Sleepy Catchfly, Silene antirrhina, 110

Snow, Barbara, and David Snow, 91

Social bonds, 6472

Social hierarchies, 6064

Socrates, 50

Sparrow-weaver, White-browed, Plocepasser mahali, 146

Species:

definitions of, 2122;

limits of, 22;

relations of individuals to, 2225

Spirituality:

defined, 194;

need of, 194

Springbuck:

display of, 5960

Squirrel, California Ground, Citellus beecheyi, 57

Stacey, Peter B., and Walter D. Koenig, 76

Starling, Chestnut-bellied, Spreo pulcher, 94

European, Stumus vulgaris, 5758

Stoics, 95

Strife:

origins among organisms of, 4144;

sexual, 4447

Sundew(s):

adhesive tentacles of, 11114

Round-leaved, 112

Swallows, 64

T

Taboos:

effects of, 18182

Teasels, Dipsacus spp., 111

Teleology, 131, 134:

"purpose" and "end," 13739;

teleonomic programs in nature, 13942

Tennyson, Alfred, Lord, 53

Termites, 64;

social bonds of, 70

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