This is a little more graceful looking than yesterday’s post especially when it is coming toward the boat. The dorsal fin of a male killer whale is proportionately larger than that of a female. In adult males, the dorsal fin is tall and triangular. Reaching a height of up to 1.8 m (6 ft.) in a large adult male, it is the tallest dorsal fin of all cetaceans. And this photo is a good example of a large male.