29 Feb '12, 4pm

Watch: How do hummingbirds sleep?

Due to their small size, hummingbirds burn lots of energy just to keep a constant body temperature — a problem that's alleviated by their high-energy nectar diet. But since they can't drink nectar while asleep, they sometimes enter brief states of "torpor " to reduce their metabolism. This is like mini-hibernation, leading to lower heart and breathing rates. The sunangel in the video may have been in torpor, forrestertr7 says: "All of the hummingbirds measured like this consumed a very low amount of oxygen at a very stable level as compared to other, larger birds, which means that they were in torpor, or a state close to torpor."

Full article: http://www.mnn.com/earth-matters/animals/blogs/watch-humm...

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