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blue tit |
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The last to join the chores, such as chaffinches and blue tits, may not chime in until 100 minutes after the first crooners began. To explore the idea, Senar and his colleagues switched 70 clutches of blue tit eggs from their original nests to foster nests with males sporting breasts of varying yellowness. A female blue tit with a particularly attractive mate is more likely to have sons than a female matched with a ho-hum guy is. |
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