An adult humpback weighs about 30 tons ​ — as much as a loaded truck — ​ and it has a relatively stiff body with large winglike flippers.
Pieaudzis kuprvalis sver aptuveni 30 tonnas — kā piekrauts kravas automobilis —, un tam ir samērā stīvs ķermenis ar lielām, spārniem līdzīgām krūšu spurām.