Weaning : 320 days.
Though close relatives of dolphins, they have key differences in both appearance and behavior.
It was only recently that the ‘finless porpoise’ was split into two distinct species – the ‘Indo-Pacific’ and the ‘narrow-ridged.’ Within the latter there are even two additional sub-species – the Yangtze finless porpoise (N. a. asiaeorientalis) and the East Asian finless porpoise or Sunameri (N. a. sunameri). 5. Importance.
First and foremost, the Chinese govenment is beginning to be more strict in enforcing regulations concerning pollution, electrofishing, and other illegal and harmful activities.
Most species are 5 to 8 feet long and weigh between 100 and 200 pounds. And to have lots of sperm, they need big testes. The common ancestor between Cetaceans and hippos evolved over 55 million years ago.
Dorsal side of most species of porpoises is grey or brown. Both species are considered vulnerable; however, the population of the Yangtze finless porpoise (N. asiaeorientalis asiaeorientalis), a subspecies of narrow-ridged finless porpoise found only in the Yangtze River, has declined significantly since 1984. Little is known about the diets of other species of porpoises. The finless porpoise is known to also follow seasonal migrations. The finless porpoise is a unique member of the Phocoenidae family and is closely related to other porpoise species, whales, and dolphins. They are termed “finless” because they lack a dorsal fin, instead bearing a thick ridge of skin along their back. The females have been known to carry her single young, or calf, on her back as on a saddle.
PETER PARKS/Getty Images.
asiaeorientalis Number Left: 1000-1800 Size: 6.2 feet The Yangtze Finless Porpoise calls the Yangtze River, the longest river in Asia, home.
It is known that populations in the mouth of the Indus River migrate to the sea from April through October to feed on the annual spawning of prawns. Fun Facts for Kids.
To be reproductively secure, harbor porpoises need to mate with multiple females during the mating season. Porpoises can dive to the depth of 650 feet but they spend majority of time close to the surface of the water.
Status: Critically Endangered Scientific Name: Neophocaena asiaeorientalis ssp.
The common porpoise makes a distinctive, explosive noise as it comes to the surface to exhale.
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They can be often seen in the bays and estuaries.
The captive population began in 1996 with some animals that were rescued.
They're most closely related to porpoises in South America, but the species diverged from these relatives at least 2.5 million years ago. Finless Porpoise. This might go in the "little-known facts about porpoises" category.
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