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 11, 2009.
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?
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