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Comparing Migrations Why Do Rufous Hummingbirds Seem Far Ahead? How can rufous hummingbirds be in Canada already, when rubythroats are still gathered in the southern United States? Are the rufous hummers faster or more eager? Is this just an unusual year? Let's explore! This map shows the rufous hummingbird migration on March 17, 2010. Look at the leading edge (birds farthest north). Roll your mouse over the map to see the rubythroat migration on the same date. Look at its leading edge. What differences do you notice?     Copyright 1997-2011 Journey North. All Rights Reserved. Questions or comments? Contact us.