Teeth are very small and numerous.
Color is a mottled grayish brown to slate-gray or black above, sometimes with lighter patches, while the undersides are paler, often with white patches under the snout and mouth or along the ventral side. Two albino specimens from the North Atlantic have been recorded. It is the second largest fish, only surpassed by the whale shark in size. Average size is 22-29 ft. The largest measured specimen was 32 ft., and a 30 ft.