The cow thing; I first heard it relative to fishing. I do think there's something to it, and the moon phase as well, but I only note those things in passing. The most obvious effect of the moon is on night activity of deer. When I lived in SC, it was legal to spotlight until 10 pm, as long as there were no weapons in the vehicle. The club I was in rode the roads after dark regularly, and we would count the number of deer seen. The most were seen when the moon was dark. On full moon nights they were noticeably absent from the fields. I figure maybe they had enough light to feed in the woods, but sightings during morning and evening hunts dropped off too. I made it a point to hunt through the noon hours, and saw lots of deer taken that way, including some big bucks.