There are three orders of marine mammals; cetacea, sirenia and carnivore. The cetacea order includes whales and dolphins while the sirenia order is mostly sea cows. The carnivore order has bears, sea lions and otters.
the answer is not "who" but actually "what are" Cetaceans are marine mammals
Cetaceans are marine mammals of the order Cetacea which includes whales, dolphins and porpoises.
Yes, by definition cetaceans are an order of mammals.
There is no such animal. All cetaceans (whales and dolphins) are carnivorous. You may be referring to the manatee or the dugong which are both marine mammals and herbivores. However, they are not considered to be cetaceans.
Marine mammals such as whales, dolphins and porpoises, are collectively labelled cetaceans (of the order Cetacea, comprising 87 modern species). Cetaceans appear to have evolved from a land mammal that began adapting to marine environments 50,000,000 years ago; the earliest known 'proto whale' (ancestor of modern Cetaceans) is named Pakicetus- a land-based quadruped that eventually evolved into Ambulocetus, which lived in shallow waters but were still able to walk on land.
Cetology http://en.wikipedia.org/wiki/Cetology
They are called marine mammals, more specifically cetaceans (whales, dolphins) rather than manatees or dugongs, or semi-aquatic mammals such as seals, sea lions, and otters.
Whales and dolphins are under the group called "cetaceans." Seals belong to the group of "pinnipeds."
They have hair
Dolphins are in the group of marine mammals called cetaceans, specifically within the family Delphinidae. Within this family, there are different genera and species of dolphins, such as bottlenose dolphins, killer whales, and spinner dolphins.
underwater mammals
Dolphins are mammals, specifically they are cetaceans.