Date: Sat Feb 21 2004 - 11:54:10 EST
The Ruby-Throated hummingbird flies over a large body of water called the gulf of Mexico. The Rufous huummingbird starts earlier than the Ruby-throated hummingbird for migration. This is because the Rufous hummers are flying over a land mass, so they can stop by, and rest which will take more time. On the other hand, the Ruby-Throated hummers have to fly over a stretch of water without stopping, and that would take less time.
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