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Comparing Migrations Why Do Rufous Hummingbirds Seem Far Ahead? The climate along the migration routes also plays a big role. This map shows average coldest temperatures. What are the coldest temperatures near the coast where the Rufous hummers are migrating? Where the Ruby-throats are migrating? Draw an imaginary line across the map, from west to east, starting at the northern edge of the Rufous migration. Can you explain why the Ruby-throats are not yet as far north as the Rufous hummers? What we think! >>   This Season Teachers Kids Orientation Registration Search Copyright 1997-2008 Journey North. All Rights Reserved. Questions or comments? Contact us.