Page "Blue whale" Paragraph 12
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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.
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