Differs from the blue whale in dorsal coloration (mottled blue-gray and without chevrons in blue whale), a V-shaped rather than a broad U-shaped rostrum, and a larger dorsal fin. Differs from the Bryde's whale in having a single median ridge on the rostrum rather than 3 ridges. Differs from the sei whale in asymmetrical lower lip coloration, mixed color baleen, and more throat grooves (56-100 vs. 32-60); dorsal fin of the fin whale is angled upward less strongly than in the sei whale (front edge more than 40 degrees in the latter); dorsal fin of fin whale tends to surface after the head does, rather than simultaneously with the head as in the sei whale; fin whale lacks the slightly downward-turned snout tip of the sei whale. (Leatherwood and Reeves 1983).
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