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Porpoises (/ ˈ p ɔː r p ə s ɪ z /) are small dolphin-like cetaceans classified under the family Phocoenidae. Although similar in appearance to dolphins, they are more closely related to narwhals and belugas than to the true dolphins. [1] There are eight extant species of porpoise, all among the smallest of the toothed whales.
Wood pilings grouped into a pair of dolphins serving as a protected entryway to a boat basin. A dolphin is a group of pilings arrayed together to serve variously as a protective hardpoint along a dock, in a waterway, or along a shore; as a means or point of stabilization of a dock, bridge, or similar structure; as a mooring point; and as a base for navigational aids.
A common bottlenose dolphin (Tursiops truncatus). A dolphin is an aquatic mammal in the clade Odontoceti (toothed whale).Dolphins belong to the families Delphinidae (the oceanic dolphins), Platanistidae (the Indian river dolphins), Iniidae (the New World river dolphins), Pontoporiidae (the brackish dolphins), and possibly extinct Lipotidae (baiji or Chinese river dolphin).
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.
Although the terms of reference of a project are sometimes referred to as the project charter, [4] there are significant differences between the two. This article describes a TOR containing detailed definitions, while a project charter has high-level requirements, assumptions, constraints and descriptions as well as a budget summary without ...
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.
The dolphin, often elaborated fantastically, might be constructed as a spout for a fountain. [34] On a modern-era fountain in the Palazzo Vecchio, Florence, Italy, Cupid seems to be strangling a dolphin. [35] Dolphins were often portrayed in antiquity as friendly to humans, and the dolphin itself could represent affection.
Flippers are one of the principal control surfaces of cetaceans (whales, dolphins and porpoises) due to their position in front of the center of mass, and their mobility which provides three degrees of freedom. [4] The tubercles on the flippers of humpback whales improve the hydrodynamics of the flipper at their size. Breaking up channels of ...