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The dorsal fin is small, visible only briefly during the dive sequence.
Located around three-quarters of the way along the length of the body, it varies in shape from one individual to another ; some only have a barely perceptible lump, but others may have prominent and falcate ( sickle-shaped ) dorsals.
When surfacing to breathe, the blue whale raises its shoulder and blowhole out of the water to a greater extent than other large whales, such as the fin or sei whales.
Observers can use this trait to differentiate between species at sea.
Some blue whales in the North Atlantic and North Pacific raise their tail fluke when diving.
When breathing, the whale emits a spectacular vertical single-column spout up to, typically.
Its lung capacity is 5, 000 litres ( 1320 U. S. gallons ).
Blue whales have twin blowholes shielded by a large splashguard.

1.838 seconds.