Baleen whale

From Free net encyclopedia

(Redirected from Mysticeti)

{{Taxobox | color = green | name = Baleen whales | image = humpbackwhale37.jpg | image_width = 200px | image_caption = Humpback Whale breaching | regnum = Animalia | phylum = Chordata | classis = Mammalia | ordo = Cetacea | subordo = Mysticeti | subordo_authority = Cope, 1891 | subdivision_ranks = Families | subdivision = Balaenidae
Balaenopteridae
Eschrichtiidae
Neobalaenidae }} Scientifically known as the Mysticeti, the baleen whales, also called whalebone whales or great whales, form a suborder of the order cetacea. The distinguishing feature between this suborder and the toothed whales is that baleen whales have baleen plates instead of teeth in the upper jaw, which enables them to filter food from water. Teeth are present only during the embryonal phase, except for fossil baleen whales which yet had teeth instead of baleen.

Baleen whales are generally larger than toothed whales, and the females are larger of the two sexes. This group comprises the largest living animal species. Baleen whales have two blowholes, causing a V-shaped blow.

The suborder contains four families and fourteen species. A list of species can be found below and at the cetacea article. Its scientific name derives from the Greek word mystax, which means "moustache."

Contents

[edit]

Feeding

Image:Baleen.jpg Baleen whales do not have teeth; they have baleen instead. They engulf sea water containing crustaceans, then close their mouth and create internal pressure by raising their tongue toward the palate to push the water out through the 'comb' of baleen plates, trapping small ocean animals, especially krill and plankton, inside.

This is called filter feeding, and is also used by Flamingos. Even though individually the crustaceans are minuscule, baleen whales take in an enormous volume of water containing them daily to maintain their survival.

There are several types of food-finding methods:

[edit]

Behaviour

[edit]

Movement

Baleen whales live in all oceans. All species travel seasonally. They spend the summer in cold waters in high latitudes, where they feed. In autumn they move to warmer waters to mate and give birth. Except in their feeding grounds, baleen whales eat little or fast for months. The Gray Whale even travels the longest migratory route of all mammals.

[edit]

Breaching

In spite of their enormous mass, baleen whales are able to leap completely out of the water. Known for their acrobacy are the Humpback Whales, but other baleen whales also break through the water surface with their body or beat it loudly with their fins. The reason of these habits is not known for certain, and they may serve several purposes.

[edit]

Sound

In contrast to toothed whales, baleen whales are unlikely to echo-locate. Instead they are able to produce sounds in the infrasonic range of high volume. The calls of the largest whales can be heard several hundreds of kilometers away. Unique are the songs of the Humpback Whales, consisting of complex sequences that may slowly evolve over years. They are probably used for courting. See the whale song article for a fuller description.

[edit]

Miscellaneous

In the 19th and early 20th centuries, baleen whales were hunted for their oil and baleen. Their oil can be made into margarine and cooking oils. The function of baleen can be found in the baleen article.

[edit]

Taxonomic classification

da:Bardehvaler de:Bartenwale es:Ballena eo:Baleno fr:Mysticeti gl:Balea ko:수염고래아목 hr:Kitovi usani it:Mysticeti he:לווייתני מזיפות hu:Sziláscetek nl:Baleinwalvissen ja:ヒゲクジラ亜目 pl:Fiszbinowce pt:Baleia sk:Kosticovce fi:Hetulavalaat sv:Bardvalar zh:鬚鯨

Retrieved from "http://www.netipedia.com/index.php/Baleen_whale"