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Typhaeus, stridulating organs of; stridulation of. Twins, tendency to produce, hereditary. Twite, proportion of the sexes in. Ugliness, said to consist in an approach to the lower animals. Umbrella-bird. Umbrina, sounds produced by. United States, rate of increase in; influence of natural selection on the progress of; change undergone by Europeans in the. Upupa epops, sounds produced by the male.
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