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flag Hummingbirds use a hibernation-like state to conserve energy during migration, study finds.

flag New research reveals how hummingbirds use a hibernation-like state called torpor to conserve energy during migration. flag Scientists found that Calliope and rufous hummingbirds need at least 180 milligrams of fat to start their day and enter torpor once they reach 500 milligrams to prevent overnight fat loss. flag This study, published in Proceedings of The Royal Society B, helps understand the birds' energy use and how changes in their food sources might affect their survival.

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