Page:Territory in Bird Life by Henry Eliot Howard (London, John Murray edition).djvu/375

Rh Sexual instinct in the migratory male, 26

—of Reeve, 173

——reawakening of, 4, 18

—life of birds, 1

—maturity, males arrive at, before females, 36

—organic change, 92, 123

—selection, 166

Shag, 121

Shrike, Red-backed, 39, 50, 51, 156

Skylark, 188, 236, 244

Snipe, 153, 156, 219, 220

Sociability when not paired, 125, 126

Song, as an aid in searching for a mate, 12

—its influence on mating, 167

—origin of, 138

—relation to reproduction, 123

—relation to territory, 119-168

—volume of, influenced by age, seasonal sexual development, or isolation, 166

Song-Thrush, 222, 244

Sparrow, House, 218

Sparrow-Hawk, 269

Spring, at approach of, birds loose their shyness, 138

Stability of the water and mobility of the land, 260

Starling, 217, 218, 237, 251

Stimulation, internal, 62, 123

question of, 284

Stonechat, 87 187, 188, 189, 222, 233, 234

Stout, Dr, Manual of Psychology, 1, 77

Struggle for existence, 294

Susceptibility to position, 96

Swallow, 21, 156, 278

, 1, 5

—adjustment of, 10

Territory and reproduction, 169-214

—breeding, 2, 3, 7

—dates of acquisition of, 33

—defence of, 6

—desertion of, after rearing young, 276

—disposition to defend, 73-118

—disposition to secure, 6, 20-72

—establishment of, 74, 285

—evolution of, 176

—failure to secure, 286

—fights for, 10, 11, 13, 62

—ownership of, 189

—possession of, a stimulus to song, 136

—its relation to migration, 259

—its relation to reproduction, 169-214

—readjustment of, 147

—restriction of, advantageous for mating, 172

—restricted, 8, 9, 30, 50, 58, 64

—separate for male and female Cuckoo, 144

—song, its relation to the, 119-68

—temporary desertion of, 28, 35, 58, 59

—and hostility, relationship between, 242

Thrush, Song, 222, 244

Tit, Blue, 221, 226

—Great, 221

—Long-tailed, 226

Tradition, 300

Tree-Pipit, 51, 188, 189, 222, 232, 244, 278

Turtle-Dove, 126, 232

of sexes, 12

Ussher, H. B., on the hostility between Choughs and Hooded Crows and Choughs and Ravens, 227