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Fueling Up in February Longer hours of sunlight in February trigger an urge to eat, eat, eat! Rubythroats stuff themselves with insects and spiders. Hummingbirds can almost double their weight in about a week. Layers of fat build on the hummingbird's back, belly, and throat. Hummingbirds typically eat nectar every 15 minutes, because flight burns so much energy. Will its fat reserves be enough to fuel the 500-mile flight? Image: Rachel Powless Search Journey North Copyright 1997-2012 Journey North. All Rights Reserved. Questions or comments? Contact us.