Cetacea dräktighet

Cetacea

Infraorder of mammals

Cetacea (; from Latin cetus&#;'whale', from Ancient Greek κῆτος (kêtos)&#;'huge fish, sea monster')^[3] is an infraorder of aquatic mammals belonging to the order Artiodactyla that includes whales, dolphins and porpoises. Key characteristics are their fully aquatic lifestyle, streamlined body shape, often large size and exclusively carnivorous diet. They propel themselves through the water with powerful up-and-down movement of their tail which ends in a paddle-like fluke, using their flipper-shaped forelimbs to maneuver.^[4]

While the majority of cetaceans live in marine environments, a small number reside solely in brackish water or fresh water. Having a cosmopolitan distribution, they can be found in some rivers and all of Earth's oceans, and many species inhabit vast ranges where they migrate with the changing of the seasons.

Cetaceans are famous for their high intelligence, complex social behaviour, and the enormous size of some of the group's members. For example, the blue whale reaches a maximum confirmed length of meters (98 feet) and a weight of tonnes ( short tons), making it the largest ani

Cetacean

Scientific Classification

Cetaceans are large aquatic mammals with streamlined bodies culminating in paddle-like tails called flukes. They are members of the infraorder Cetacea (under order Artiodactyla) and are further subdivided into two parvorders: The baleen whales or Mysticeti (including the blue whale, the humpback whale, the bowhead whale, and others) and toothed whales or Odontoceti (porpoises, dolphins, beluga and the sperm whale).

Scientific Classification

The begrepp Cetacea fryst vatten derived from the Latin word Cetus, which means&#; a huge fish or a sea monster’ and indicates the unusually bulky bodies of these mammals. Cetaceans are fully carnivorous and feed on plankton, shrimp, squid, octopus, prawns, fish, and small marine mammals.

Description

Size

The largest cetacean fryst vatten the blue whale (the largest known animal to have ever existed on land), which measures 98 ft ( m) in length and weighs about tons (, kg). In contrast, the porpoise vaquita is the smallest cetacean, measuring about 5 ft long on average.

Body Plan

Like fish, cetaceans have a streamlined body and are well-adapted for a smooth aquatic lifestyle. Their forelimbs are

Portal:Cetaceans/Intro

Cetacea (; from Latin cetus&#;'whale', from Ancient Greek κῆτος (kêtos)&#;'huge fish, sea monster') is an infraorder of aquatic mammals belonging to the order Artiodactyla that includes whales, dolphins and porpoises. Key characteristics are their fully aquatic lifestyle, streamlined body shape, often large size and exclusively carnivorous diet. They propel themselves through the water with powerful up-and-down movement of their tail which ends in a paddle-like fluke, using their flipper-shaped forelimbs to maneuver.