The different phases of the moon definitely affect elk. Observers and wildlife biologists have noted that during the full moon phase, elk tend to be much more active at night because they can see better to feed, and they can also spot predators more easily.
During the low moon phase elk tend to be much less active at night. Light is dim, and the elk tend to bed down more and watch out for stalking predators.
The phases of the moon even affect the elk breeding. The elk tend to bugle less and rut less during the low moon phases, when sudden movement in dim light can cause an accident. But when the moon is full the elk rut had all night.
Moon phases also indirectly affect daytime elk activity. The normal patterns of feed to bed in early morning and late evening are greatly disrupted because the elk have so much more feeding time during the full moon cycle, that the animals are usually already bedded down at first morning light. Conversely, the elk tend to be up and moving earlier in the evening because they’d been bedded for so long.
During the low moon phase the elk ten to be more active feeding longer into the morning hours because they’d spent much less time feeding during the dark night hours. And in evening, the elk tend to leave their beds a bit earlier to get enough feeding in before the dark of the night sets in.