Maximum length: 30 m; Calves: 7 m
Maximum weight: 144 tonnes
- wide flat head having one median ridge and two blowholes
- relatively small dorsal fin, long pointed flippers and broad straight-edged flukes
- 55 - 68 ventral grooves extend to the naval
- blowholes are protected by large, fleshy "splash guards"
- 270 - 395 baleen plates on both sides
- colour: mottled bluish grey; the yellowish hue on the belly of some animals