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The two parvorders, baleen whales (Mysticeti) and toothed whales (Odontoceti), are thought to have diverged around thirty-four million years ago.Baleen whales have bristles made of keratin instead of teeth.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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Though not as flexible or agile as seals, cetaceans can swim very quickly, with the killer whale able to travel at 56 kilometres per hour (35 mph) in short bursts and the fin whale able to cruise at 48 kilometres per hour (30 mph).

Dolphins are able to make very tight turns while swimming at high speeds.

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

Cetaceans have been depicted in various cultures worldwide.

Some species are well adapted for diving to great depths.

Although cetaceans are widespread, most species prefer the colder waters of the Northern and Southern Hemispheres.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.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.Cetaceans belong to the order Cetartiodactyla (formed by combining Cetacea Artiodactyla) and their closest living relatives are hippopotamuses and other hoofed mammals (camels, pigs, and ruminants), having diverged about 50 million years ago.

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