The early bird catches the sperm

Getting up later in the morning might gain you more sleep, but it could mean you end up fathering fewer offspring—at least if you are a songbird called the great tit. Ecologists from the United States and Germany have discovered that compared with early birds, late risers are more likely to be cuckolded, meaning that they unknowingly end up raising young in their nest that had been fathered by another male. It appears that in the early morning hours, they're still asleep rather than being awake and defending their mate.

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