In this June 10, 2008 photo provided by Terry Sohl, a male Ruby-throated hummingbird feeds at a honeysuckle plant, in Brandon, S.D. Ruby-throated hummingbirds are migrating to North America weeks earlier than in decades past, and research indicates that higher temperatures in their winter habitat may be the reason. Researchers say the early arrival could mean less food at nesting time for the tiny birds that feed on insect pests, help pollinate flowers and are popular with birdwatchers. (AP Photo/Terry Sohl)

Associated Press
In this June 10, 2008 photo provided by Terry Sohl, a male Ruby-throated hummingbird feeds at a honeysuckle plant, in Brandon, S.D.   Ruby-throated hummingbirds are migrating to North America weeks earlier than in decades past, and research indicates that higher temperatures in their winter habitat may be the reason. Researchers say the early arrival could mean less food at nesting time for the tiny birds that feed on insect pests, help pollinate flowers and are popular with birdwatchers. (AP Photo/Terry Sohl)
In this June 10, 2008 photo provided by Terry Sohl, a male Ruby-throated hummingbird feeds at a honeysuckle plant, in Brandon, S.D. Ruby-throated hummingbirds are migrating to North America weeks earlier than in decades past, and research indicates that higher temperatures in their winter habitat may be the reason. Researchers say the early arrival could mean less food at nesting time for the tiny birds that feed on insect pests, help pollinate flowers and are popular with birdwatchers. (AP Photo/Terry Sohl)
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