I think there may be something to the light cycle. Through the range of all North American snakes that hibernate and don't the hours of light per day fluctuates through the year. Not to mention some Amphibian species require a slightly fluctuating light cycle in order to stay healthy and reduce stress. It would also make sense for at least Eastern Hogs. They have been reported to breed during all seasons in their southern range but stick more towards spring breeding. Being Diurnal the increase in hours of light per day may have a stimulating effect for the females to begin laying pheromone trails. I don't know if this is actually what happens or not as far as stimulation goes, it could be wrong or it could just be a part of a greater whole, but it makes some sense to me.

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