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As these two species are closely allied, and belong to the order of Insessores, which includes nearly all the singing-birds in the world, it is possible that a progenitor of the sparrow may have been a songster.
Insects, relative size of the cerebral ganglia in; male, appearance of, before the females; pursuit of female, by the males; period of development of sexual characters in; secondary sexual characters of; kept in cages; stridulation. Insessores, vocal organs of. Instep, depth of, in soldiers and sailors. Instinct and intelligence. Instinct, migratory, vanquishing the maternal.
Viscera, variability of, in man. Vlacovich, Prof., on the ischio-pubic muscle. Vocal music of birds. Vocal organs of man; of birds; of frogs; of the Insessores; difference of, in the sexes of birds; primarily used in relation to the propagation of the species.
It is more remarkable that parrots, belonging to a group distinct from the Insessores, and having differently constructed vocal organs, can be taught not only to speak, but to pipe or whistle tunes invented by man, so that they must have some musical capacity. Nevertheless it would be very rash to assume that parrots are descended from some ancient form which was a songster.
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