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The following is a list of currently existing (or, in the jargon of taxonomy) 'extant' species of the infraorder cetacea (for extinct cetacean species, see the list of extinct cetaceans). The list is organized taxonomically into parvorders, superfamilies when applicable, families, subfamilies when applicable, genus, and then species.
The species has been recorded making the longest dive ever documented for any mammal, rendering its detection and the estimation of its abundance very difficult. [124] Its distribution is known mainly through strandings. [125] It is also one of the cetacean species most frequently found stranded in the North-Eastern Caribbean. [127]
Despite this trend, dolphinariums are still widespread in Europe, Japan and North America. The most common species of dolphin kept in dolphinariums is the bottlenose dolphin, as it is relatively easy to train and has a long lifespan in captivity. While trade in dolphins is internationally regulated, other aspects of keeping dolphins in ...
Cetacea (/ s ɪ ˈ t eɪ ʃ ə /; from Latin cetus 'whale', from Ancient Greek κῆτος () 'huge fish, sea monster') [3] is an infraorder of aquatic mammals belonging to the order Artiodactyla that includes whales, dolphins and porpoises.
The sea otter evolved initially in northern Hokkaidō and Russia, and then spread east to the Aleutian Islands, mainland Alaska, and down the North American coast. In comparison to cetaceans, sirenians, and pinnipeds, which entered the water approximately 50, 40, and 20 mya, respectively, the sea otter is a relative newcomer to marine life.
The species occurs primarily in the North Pacific Ocean, where it is a deep-water cetacean, often frequenting depths between 1,000 and 3,000 m (3,280 and 9,840 ft) in its search for prey. In the northwestern part of its range, sightings have been documented off of Hokkaido, Japan , Sakhalin and Kamchatka , as well as in the Sea of Okhotsk , the ...
The number of individuals taken each year is in the thousands, although a quota of around 17,000 per year is in effect today [51] making it the largest direct hunt of any cetacean species in the world [52] and the sustainability of the hunt has been questioned. [53] [54]
The narwhal is a stocky cetacean with a relatively blunt snout, a large melon, and a shallow ridge in place of a dorsal fin. Males of this species have a large (1.5–3.0 m (4 ft 11 in – 9 ft 10 in)) long tusk, which is a protruding left canine thought to function as a weapon, a tool for feeding, in attracting mates or sensing water salinity.