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migratory southern giant hummingbirdsCNN
•89% Informative
Charles Darwin first observed the giant hummingbird of South America in 1834 .
Darwin observed the birds, which are about eight times the size of typical hummingbirds, breeding along the Pacific coast of Chile .
Researchers attached tiny backpacks to hummingbirds to study migration patterns in Chile and Peru .
Giant hummingbirds differ from hundreds of other hummingbird species in many other ways.
Scientists believe the longest known hummingbird migration spans 5,200 miles ( 8,368 kilometers ) The northern giant hummingbird has a different lung and blood capacity compared with the southern giant.
The two species have been evolving separately for about 3 million years .
Researchers want to better understand how the two populations interact.
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