Physical Statistics:
Fin whales range in size from 50-70 feet. They are second only to the blue whales in size and can weigh up to 50 tons.

Field Marks:
Fin whales have a tall, thin blow or spout that reaches 20-25 feet in height. After seeing the blow and a long portion of the back, a very large, triangular shaped dorsal fin is apparent. Although hard to see, the small flippers of the fin whale are dark above and white below. When diving, fin whales will arch the back slightly but rarely bring the tail or fluke above the water's surface. Once a dive has occurred, the animal usually stays down for 7-9 minutes but can stay submerged for up to 45. Fin whales are usually seen alone or in pairs, but occasionally can be found in groups of 8-15 individuals.

Individual Identification:
Fin whales are one of only two marine mammals that are asymmetrical in body coloration. A prominent white pattern, roughly v-shaped, is present on the right side of the body and virtually absent on  the left. It is called a chevron pattern and is as unique to the individual as fingerprints are to us. Using the chevron pattern in conjunction with the shape of the dorsal fin and any scars on the body, each fin whale is given an individual identification number for tracking them, although there are a small number that actually have names.

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