Abnormal Bird Migrations

I haven't seen it myself but on other boards people have noted that they have seen flocks of geese going south for the winter (which is normal) and then a flock (possibly the same flock) flying north another day. This could be due to a changed magnetic field on the earth but I came up with another idea when meditating. I sometimes get voices when I am in a trance and I was considering the bird migration when I heard a voice say "They're warning us". The thought seems plausabile. What do you think?

Many geese now overwinter in northern areas. All they need is food, which is plentiful in both the urban and rural environment. Open water is nice, but not nesessary.

Individual flocks may move around locally.