The bald eagle forms a species pair with the white-tailed eagle of Eurasia. This species pair consists of a white-headed and a tan-headed species of roughly equal size; the white-tailed eagle also has overall somewhat paler brown body plumage. The two species fill the same ecological niche in their respective ranges. The pair diverged from other sea eagles at the beginning of the Early Miocene (c. 10 Ma BP) at the latest, but possibly as early as the Early/Middle Oligocene, 28 Ma BP, if the most ancient fossil record is correctly assigned to this genus.
the bald eagle forms a species pair with the white-tailed eagle of eurasia this species pair consists of a white-headed and a tan-headed species of roughly equal size; the white-tailed eagle also has overall somewhat paler brown body plumage the two species fill the same ecological niche in their respective ranges the pair diverged from other sea eagles at the beginning of the early miocene (c 10 ma bp) at the latest but possibly as early as the early/middle oligocene 28 ma bp if the most ancient fossil record is correctly assigned to this genus