Dorsal (Top) Side
A gray whale has no dorsal (top) fin. A prominent dorsal hump rises about two-thirds of the way back on the body. The dorsal hump is followed by 6 to 12 bumps (knuckles) along the dorsal ridge that extend to the fluke, or tail.
![Gray whale pectoral fin](https://s3.us-east-2.amazonaws.com/journeynorth.org/images/graphics/u-z/gwhale_SZable.jpg)
Photo: Steve Zabel
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