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Porpoises, along with whales and dolphins, are descendants of land-living ungulates (hoofed animals) that first entered the oceans around 50 million years ago (Mya). During the Miocene (23 to 5 Mya), mammals were fairly modern, meaning they seldom changed physiologically from the time. The cetaceans diversified, and fossil evidence suggests ...
Porpoising, also known as running, [11] is a high speed surface behaviour of small cetaceans where long jumps are alternated with swimming close to the surface. Despite the name, porpoising behaviour is seen in dolphins and porpoises, as well as other marine species such as penguins [12] and pinnipeds. [13]
1. A towed or self-propelled flat-bottomed boat, built mainly for river, canal or coastal transport of heavy goods. 2. Admiral ' s barge: A boat (or aircraft) at the disposal of an admiral (or other high ranking flag officer) for his or her use as transportation between a larger vessel and the shore, or within a harbor. In Royal Navy service ...
Herman Melville titles Chapter 53 of Moby-Dick, "The Gam."After explaining that the word does not appear in dictionaries, he gives his own definition: GAM. Noun - A social meeting of two (or more) Whale-ships, generally on a cruising- ground; when, after exchanging hails, they exchange visits by boats' crews: the two captains remaining, for the time, on board of one ship, and the two chief ...
The harbour porpoise (Phocoena phocoena) is one of eight extant species of porpoise. It is one of the smallest species of cetacean . As its name implies, it stays close to coastal areas or river estuaries, and as such, is the most familiar porpoise to whale watchers .
The Porpoise class were submarines built for the United States Navy in the late 1930s, and incorporated a number of modern features that would make them the basis for the subsequent Salmon, Sargo, Tambor, Gato, Balao, and Tench classes. In some references, the Porpoises are called the "P" class. [7]
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.
Trawling is an industrial method of fishing that involves pulling a fishing net through the water behind one or more boats. The net used for trawling is called a trawl. This principle requires netting bags which are towed through water to catch different species of fishes or sometimes targeted species.