Role of Ambient Temperature in Emergence of Woodchucks (Marmota monax) from Hibernation

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Abstract
The dates of emergence from its burrow of the 1st woodchuck of the year over a 13 yr period ranged from Jan 29 to Feb 13 in south-central Pennsylvania [USA]. Emergence of subsequent woodchucks was correlated with periods of warm weather. It seems likely that terminal arousal from hibernation is controlled by a circannual clock and that actual emergence depends on the daily temperature.

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