Balaenoptera borealis (Sei Whale)
Balaenoptera borealis Lesson, 1828
It is a medium-sized species. The dorsal coloration pattern of adults is generally dark metallic gray, with bluish shading extending onto the sides of the body. Older individuals have lighter shading, from gray to white or yellowish, with oval scars on the body caused by copepods. The ventral…