Two bald eagle chicks, estimated to be about a week and a half old, share a nest. The eaglets are in the process of replacing their natal down with thermal down, a process that begins at about 10 days of age. They are hatched with natal down, a light-colored down that has little insulating ability. After its replaced with thermal down, which occurs at about 15 days of age, the eaglets are able to regulate their body temperature on their own.
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