Fueling Up
How do hummers fuel up for migration? They gorge on insects and spiders — almost doubling their weight in about a week. Layers of fat build up on the hummingbird's back, belly, and throat. A licensed bander gently blew on this hummer's feathers to see the white band of fat on its belly.
![Journey North: Hummingbird Migration](https://s3.us-east-2.amazonaws.com/journeynorth.org/images/graphics/humm/FatOnHumm_RachelPowless.jpg)
Rachel Powless
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