The humpback whale is a species of baleen whale. It is one of the larger rorqual species, with adults ranging in length from 12–16 m and weighing around 25–30 t. The humpback has a distinctive body shape, with long pectoral fins and a knobbly head. 

• Mass: 25,000 – 30,000 kg
• Lifespan: 45 – 50 years
• Conservation status: Least Concern (Population increasing)
• Scientific name: Megaptera novaeangliae
• Gestation period: 11 months Encyclopedia of Life
• Order: Artiodactyla

The sperm whale or cachalot is the largest of the toothed whales and the largest toothed predator. It is the only living member of the genus Physeter and one of three extant species in the sperm whale family, along with the pygmy sperm whale and dwarf sperm whale of the genus Kogia. 

• Conservation status: Vulnerable 
• Length: 16 m (Adult)
• Species: P. macrocephalus
• Class: Mammalia
• Order: Artiodactyla
• Family: Physeteridae
• Mass: 41,000 kg (Adult), 14,000 kg (Adult)

The southern right whale is a baleen whale, one of three species classified as right whales belonging to the genus Eubalaena. Southern right whales inhabit oceans south of the Equator, between the latitudes of 20° and 60° south. In 2009 the global population was estimated to be approximately 13,600. 

• Scientific name: Eubalaena australis
• Conservation status: Least Concern (Population increasing) Encyclopedia of Life
• Mass: 23,000 kg (Adult) Encyclopedia of Life
• Order: Artiodactyla
• Family: Balaenidae
• Phylum: Chordata

The blue whale is a marine mammal belonging to the baleen whale parvorder Mysticeti. Reaching a maximum confirmed length of 29.9 metres and weighing up to 199 tonnes, it is the largest animal known to have ever existed. 

• Mass: 130,000 – 150,000 kg (Adult)
• Lifespan: 80 – 90 years (In the wild, Estimated)
• Gestation period: 10 – 12 months
• Conservation status: Endangered (Population increasing) Encyclopedia of Life
• Species: B. musculus
• Class: Mammalia
• Length: 26 m (Southern hemisphere population, Adult), 24 m (Northern hemisphere population, Adult)

The dusky dolphin is a dolphin found in coastal waters in the Southern Hemisphere. Its specific epithet is Latin for "dark" or "dim". It is very closely genetically related to the Pacific white-sided dolphin, but current scientific consensus holds they are distinct species.

• Species: L. obscurus
• Order: Artiodactyla
• Family: Delphinidae
• Phylum: Chordata
• Class: Mammalia
• Genus: Lagenorhynchus
• Kingdom: Animalia

Hector's dolphin is one of four dolphin species belonging to the genus Cephalorhynchus. Hector's dolphin is the only cetacean endemic to New Zealand, and comprises two subspecies: C. h. hectori, the ... Wikipedia

• Conservation status: Endangered (Population decreasing) 
• Scientific name: Cephalorhynchus hectori
• Trophic level: Carnivorous Encyclopedia of Life
• Mass: 50 kg (Adult) Encyclopedia of Life
• Order: Artiodactyla
• Family: Delphinidae
• Phylum: Chordata

Bottlenose dolphins are aquatic mammals in the genus Tursiops. They are common, cosmopolitan members of the family Delphinidae, the family of oceanic dolphins. Molecular studies show the genus definitively contains two species: the common bottlenose dolphin and the Indo-Pacific bottlenose dolphin.

• Scientific name: Tursiops
• Order: Artiodactyla
• Family: Delphinidae
• Subfamily: Delphininae
• Phylum: Chordata
• Kingdom: Animalia