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Perch, brightness of male, during breeding season. Peregrine falcon, new mate found by. Period of variability, relation of, to sexual selection. Periodicity, vital, Dr. Laycock on. Periods, lunar, followed by functions in man and animals. Periods of life, inheritance at corresponding. Perisoreus canadensis, young of. Peritrichia, difference of colour in the sexes of a species of. Periwinkle.
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