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The Sei whale (pronounced "say") can measure up to 65 ft (19.8 meters) in length and weighs about 14-17 tons, making it the third largest baleen whale (baleen meaning to have overlapping plates hanging from the upper jaw). Females are slightly larger than males. It spouts water 6-8 ft into the air from its unique inverted "V" shaped spout. Sei whales swimming at speeds of up to 34.5 miles per hour are among the fastest baleen whales. They tend to travel alone or in very small groups. Generally, they are bluish-gray with variable white underbellies and some may have light patches on the upper body. The Sei also has 32 to 60 throat grooves.