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Biological Clock Ticks Slower For Female Birds Who Choose Good Mates

According to a new study, female fertility in birds declines with age. But some female birds can slow the ticking of their biological clocks by choosing the right mates. Older females lay fewer eggs, and they lay them later in the season--at a time when less food is available for their chicks.

"These results are very unexpected, and one cannot help but wonder if they apply to vertebrates more generally," says Saran Twombly, program director in the National Science Foundation's Division of Environmental Biology, which funded the research.

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