"They're the only bird in the world that can fly upside down and backwards," says Holly Ernest, a conservation ecologist with the University of Wyoming. "They drink pure sugar and don't die of diabetes."
Shankar, now of the Tata Institute of Fundamental Research in Hyderabad, India, tried to figure out how broad-billed hummingbirds in Southern Arizona spend their days. Using a mix of experimental methods, she measured the birds' metabolic rate during various activities and estimated their total daily energy expenditure.
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