Porpoise
Porpoise
Porpoise (/ˈpɔːrpəs/; from Middle English porpeis, from Old French porpois, from Medieval Latin porcopiscis : Latin porcus, pig + piscis, fish) is a group of fully aquatic marine mammals, similar in appearance to a dolphin, but differing in several physical characteristics. They are part of the family Phocoenidae, which is one of the families in the order Cetaceans.
Etymology
The word "porpoise" comes from the Middle English "porpeis," which itself comes from the Old French "porpois." This term is derived from the Medieval Latin "porcopiscis," a combination of the Latin words "porcus" (meaning pig) and "piscis" (meaning fish).
Characteristics
Porpoises are small to medium-sized as compared to other cetaceans. They have a stocky body and a rounded or beaked nose. Unlike dolphins, porpoises have spade-shaped teeth rather than conical. They are known for their ability to swim quickly and agilely through the water.
Species
There are six extant species of porpoise: the harbour porpoise, the Burmeister's porpoise, the Dall's porpoise, the spectacled porpoise, the finless porpoise, and the vaquita, which is critically endangered.
Habitat and Distribution
Porpoises can be found in oceans and seas all over the world, with different species having different ranges. Some prefer colder waters, while others inhabit tropical or subtropical waters.
Conservation
Many species of porpoise are threatened or endangered due to factors such as habitat loss, pollution, and bycatch in fishing nets. The vaquita is the most endangered marine mammal, with an estimated population of less than 20 individuals.
External links
- Medical encyclopedia article on Porpoise
- Wikipedia's article - Porpoise
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