| Fat
Makes Them Fit!
All
that eating builds up layers of fat on the back, belly, and throat.
How fat are hummers before they migrate? They almost double
their weight! Can you imagine putting on 100 pounds before
a marathon race? Human bodies couldn't handle it. But birds are
great at getting energy from fat, and well-adapted hummingbird wings
can bear the weight.
A
hummingbird bander blows on a hummingbird's chest feathers. Through
the thin clear skin, you can see whitish-yellow fat.
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