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Since eagles are warm-blooded, they radiate their own heat. In the thermal
infrared images below, the eagle had just flown into a shaded area after being in
warm sunlight. Notice how his back still glows from the heat of the sun!
In the bottom four images, the eagles had been in the shade for a while, and
you can see their internal body heat shining through areas which are not covered
or are thinly covered with feathers. Warm-blooded animals can help keep their
internal body temperature constant by changing their location. For example,
they can move into the shade when they are too warm.
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