Bluntnose sixgill is about 1.56× longer by these reference values.
Bluntnose sixgill uses a 4.8 m upper reference, compared with 3.08 m for Nurse shark. Bluntnose sixgill's weight reference is about 5.4× heavier.
ON THE SAME SCALE
Human. Bus. Whale.
Pick your reference.
Length bars use upper comparison values and do not show body depth, tail proportion or typical adult size. A long thresher tail, for example, does not equal whale-shark body mass.
THE NUMBERS
Side by side.
WHAT THE DATA CAN SAY
Size is not the whole animal.
Length and weight
Nurse shark is represented by recorded to 3.08 m / 10.1 ft; Bluntnose sixgill by reported to 4.8 m / 15.8 ft. Length is a recorded maximum; mass is a rounded adult reference. Deepwater sampling is difficult, so upper records are sparse.
Bite evidence
Nurse shark: Suction performance is central to feeding and is not captured by bite-force rankings. Bluntnose sixgill: No standardized maximum is available.
Living versus extinct
Both species are living, but record-sized individuals are rare. These upper references should not be read as normal adult size.
Ecology changes the matchup
A small mouth and powerful suction suit its bottom-feeding life. Its six gill slits mark an ancient branch of shark diversity.
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