Tall dorsal fin of a Finback whale (Balaenoptera physalus) which is located far back along the dorsal ridge. This prominent feature is often used for identification. St. Lawrence estuary, Canada

finback whale fin whale whales finback balaenoptera physalus st lawrence estuary canada north america water surfacing one animal lone single baleen mammal cetacean dorsal fin swimming close up close ups close up close ups razorback common rorqual