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Porpoises are distinguished from dolphins by their flattened, spade-shaped teeth distinct from the conical teeth of dolphins, and lack of a pronounced beak, although some dolphins (e.g. Hector's dolphin) also lack a pronounced beak. Porpoises, and other cetaceans, belong to the clade Cetartiodactyla with even-toed ungulates.
They are distinct from dolphins, although the word "porpoise" has been used to refer to any small dolphin, especially by sailors and fishermen. The most obvious visible differences between the two groups are that porpoises have a less pronounced beak, and have spade-shaped teeth as opposed to conical.
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.
Adults are usually 1.3–1.5 metres long and weigh around 30 kg. Females are slightly larger than males, which is not typical for other dolphins. It has a short head with a rounded blurred face, making it look different than other dolphins. The low dorsal fin has a triangular shape with a wide base, while its pectoral fins have rounded ends ...
Excluding dolphins and porpoises, odontocetes consist of four families: belugas and narwhals (monodontids), sperm whales (physeterids), dwarf and pygmy sperm whales (kogiids), and beaked whales (ziphiids). [6] The differences between families of odontocetes include size, feeding adaptations and distribution.
The welfare fund has responded to more than 400 live stranded dolphins, whales and porpoises in the region in the past five years alone, the organization said in a news release. Cape Cod is a good ...
A humpback whale (Megaptera novaeangliae) A leopard seal (Hydrurga leptonyx). Marine mammals are mammals that rely on marine (saltwater) ecosystems for their existence. They include animals such as cetaceans (whales, dolphins and porpoises), pinnipeds (seals, sea lions and walruses), sirenians (manatees and dugongs), sea otters and polar bears.
A volunteer surveyor who spots wildlife on a ferry route named the best for seeing marine life says the role is "one of the best things I have done in my life".