Massive raptor with rather long, heavy bill; broad, plank-like wings; and relatively short, graduated tail. Looks like a flying barn door and soars with wings rather level (not slightly raised like Golden Eagle). Plumage dark overall. Adult has paler brown head and body, white tail, yellowish bill. Immature starts with mostly brown tail streaked white, blackish bill; attains fully white tail in about 4 years. Generally uncommon, mainly found along seacoasts and larger rivers (feeds predominantly on fish).