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Binkley, Sue. The Clockwork Sparrow: Time, Clocks, and Calendars in Biological Organisms. Prentice-Hall, Englewood Cliffs, NJ, 1990.

Cole, Charles J. "Unisexual Lizards." Scientific American, January 1984,
p. 94. Whiptail lizards reproduce by parthenogenesis: virgin birth.

John, Bernard. Meiosis. Cambridge University Press, Cambridge and New York, 1990.

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