1 Kingdom: Animalia. Whales belong to the kingdom Animalia because whales have many cells, ingest food, and are formed from a "blastula" (from a fertilized egg). 2 Phylum: Chordata. ... 3 Class: Mammalia. ... 4 Order: Cetacea. ... 5 Suborder: Mysticeti. ... 6 Family: Balaenidae. ... 7 Genus: Balaenoptera. ... 8 Species: musculus. ...