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Porpoises, and other cetaceans, belong to the clade Cetartiodactyla with even-toed ungulates. Porpoises range in size from the vaquita, at 1.4 metres (4 feet 7 inches) in length and 54 kilograms (119 pounds) in weight, to the Dall's porpoise, at 2.3 m (7 ft 7 in) and 220 kg (490 lb).
Harbour porpoises tend to be solitary foragers, but they do sometimes hunt in packs and herd fish together. [11] Young porpoises need to consume about 7% to 8% of their body weight each day to survive, which is approximately 15 pounds or 7 kilograms of fish. Significant predators of harbour porpoises include white sharks and killer whales (orcas).
Spectacled porpoise: circumpolar in cool sub-Antarctic and low Antarctic waters Phocoena phocoena: Harbour porpoise: cooler coastal waters of the North Atlantic, North Pacific and the Black Sea Phocoena sinus: Vaquita: northern area of the Gulf of California, or Sea of Cortez Phocoena spinipinnis: Burmeister's porpoise: coast of South America
As with other porpoise species, the spectacled porpoise has no beak. It has small pectoral fins with rounded tips positioned far forward on the body, and a triangular dorsal fin. This porpoise species shows obvious sexual dimorphism between adult males and females, as the dorsal fins in males are much larger and more rounded than those of ...
Cetacean intelligence is the overall intelligence and derived cognitive ability of aquatic mammals belonging in the infraorder Cetacea (cetaceans), including baleen whales, porpoises, and dolphins. In 2014, a study found for first time that the long-finned pilot whale has more neocortical neurons than any other mammal, including humans ...
In 2017 Hoyt published Encyclopedia of Whales, Dolphins and Porpoises which "draws on more than 40 years of scientific interactions with these intelligent and fascinating creatures," according to Library Journal: "Hoyt writes movingly on life cycles, the future for these animals and how readers can get involved in protecting them."
The vaquita (/ v ə ˈ k iː t ə / və-KEE-tə; Phocoena sinus) is a species of porpoise endemic to the northern end of the Gulf of California in Baja California, Mexico.Reaching a maximum body length of 150 cm (4.9 ft) (females) or 140 cm (4.6 ft) (males), it is the smallest of all living cetaceans.
Dall's porpoise (Phocoenoides dalli) is a species of porpoise endemic to the North Pacific. It is the largest of porpoises and the only member of the genus Phocoenoides. The species is named after American naturalist W. H. Dall. William Healey Dall's 1873 field notes on Phocoenoides from the Smithsonian Institution's Field Books collection