Why do deer rut? Why do migratory birds fly south? Or north for that matter in the spring? Why do carbou migrate?
Natures Clock: Photoperiodism
i agree with adams^^^
but.....i think that the rut does start to happen at about the time in middle November (13th) which is usually about the time of a full moon. i have heard a theory that the rut is triggered by the full moon-the full moon triggers something in the deer's retina of the eye which gets the deer into the rutting mode. i do not know if this is true or not?????