February 9, 2012 Northern Shrikes on the move north?

The Northern Shrike is a regular winter visitor to eastern Ontario. The first individuals are usually observed in late October and early November. Over the course of the winter there numbers can vary as birds continue to move south in search of food. Over the past week I've observed 10+ Northern Shrikes in areas that I haven't seen them during the winter so far. I one case the shrike was singing. That was one of the few times I've heard Northern Shrike vocalize south of their breeding grounds. Are these birds on the move south or north already. Maybe just in search of food.

Northern Shrikes appear to be on the move.