This male whale can be identified by the battle scars on him, which are the result of fighting with other males. They are jealous creatures and fight aggressively over the females, who are much more passive.
“The whales have barnacles on them, and these are the scrapes from his opponent’s barnacles,” explains Stevenson. “You can see that the dorsal fin is all mashed up. That is because they ride on top of each other, and they slash each other.”