A humpback uses its blowholes for breathing, not the mouth. Toothed whales, like killer whales and dolphins only have a single blowhole. Humpbacks can stay submerged for 45 minutes, but usually dive for 10 to 15 minutes. They may also slap their pec fins on the surface making a tremendous sound. Competing males may use barnacle encrusted pec fins as weapons against one another.
Pec fins have most of the bones present in our own arms and hands, except for the thumb bones.
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