They also depend on the sweetest nectar in flowers for survival and eat all day long visiting more than 1000 flowers in a day.
In an average 12 hour day, a 10-gram hummingbird such as the male Anna's hummingbird will need 6,660 calories to live. More than 1/3 of that amount is spent hovering to gather food.
http://www.nectarartprints.com/hb_food.htm
How about this for those on a calorie restricted diet?
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