Eastern Chipmunks breed twice a year, in March and in June. If you’ve seen a chipmunk this spring, chances are it was a male, as males emerge several weeks before females. When they first come above ground, males check out female territories. When females appear they soon come into estrus, which lasts for roughly a week. However, they are only receptive to males for about a seven-hour period during this week. Outside of these seven hours, females will aggressively repel any advances. When males sense that their timing is right, they indicate their interest and intention by waving their tail up and down. This only occurs during the mating season – at all other times chipmunks only wave their tail horizontally back and forth!
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