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The hindlimbs of cetaceans are internal, and are thought to be vestigial.Baleen whales have short hairs on their mouth, unlike the toothed whales.Some websites have reported an increase in traffic as high as 350 per cent with some of the most popular sites bombarding singletons with adverts to convince them that 2013, or even the tail end of 2012, could be their time to be lucky in love.

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Dolphins are commonly kept in captivity and are even sometimes trained to perform tricks and tasks, other cetaceans aren't as often kept in captivity (with usually unsuccessful attempts).

Cetaceans have been relentlessly hunted by commercial industries for their products, although this is now forbidden by international law.

) are a widely distributed and diverse clade of aquatic mammals that today consists of the whales, dolphins, and porpoises. There are around 89 extant species, which are divided into two groups or parvorders, the Odontoceti or toothed whales, a group of more than 70 species that includes the dolphins, porpoises, belugas, narwhals, sperm and beaked whales, and the Mysticeti or baleen whales, of which there are now 15 species.

The name is derived from the Latin cetus "whale", itself from the Greek κῆτος kētos "huge fish".

Most mysticetes prefer the food-rich colder waters of the Northern and Southern Hemispheres, migrating to the Equator to give birth.

During this process, they are capable of fasting for several months, relying on their fat reserves.

Mothers of some species fast and nurse their young for a relatively short period of time, which is more typical of baleen whales as their main food source (invertebrates) aren't found in their breeding and calving grounds (tropics).

Cetaceans produce a number of vocalizations, notably the clicks and whistles of dolphins and the moaning songs of the humpback whale.

The meat, blubber and oil of cetaceans have traditionally been used by indigenous peoples of the Arctic.

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