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I don't know for sure, but these links came up with a little searching... if it helps, great, if not, sorry.
During very cold Winter days, Snow Fleas are not very active. But if it warms up, Snow Fleas will become active and look for food. They may even crawl out onto the surface of snow. This is how Snow Fleas get their name. People notice large amounts of them, like black dust, around the base of a tree. They are usually there when there isn't snow too, as long as the temperature is warm enough; you just see them better on a white background.
I use to see this in Pennsylvania all the time I figured it was from deer or something?
I see we have peopel trying to debunk it. Lay off the conspiracy pills.edit on 11-2-2014 by zombiefreekshow because: (no reason given)