Snow-goose, whiteness of the.
Sociability, the sense of duty connected with; impulse to, in animals;
manifestations of, in man; instinct of, in animals.
Social animals, affection of, for each other; defence of, by the males.
Sociality, probable, of primeval men; influence of, on the development
of the intellectual faculties; origin of, in man.
Soldiers, American, measurements of.
Soldiers and sailors, difference in the proportions of.
Solenostoma, bright colours and marsupial sac of the females of.
Song, of male birds appreciated by their females; want of, in brilliant
plumaged birds; of birds.
Sorex, odour of.
Sounds, admired alike by man and animals; produced by fishes; produced
by male frogs and toads; instrumentally produced by birds.
Spain, decadence of.
Sparassus smaragdulus, difference of colour in the sexes of.
Sparrow, pugnacity of the male; acquisition of the Linnet s song by a;
coloration of the; immature plumage of the.
Sparrow, white-crowned, young of the.
Sparrows, house-and tree-.
Sparrows, new mates found by.
Sparrows, sexes and young of; learning to sing.
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