Porpoise teeth are spade-shaped whilst dolphins are conical. Pups are weaned after only 3-4 days, the shortest weaning period of any mammal, and during these first few days their body weight nearly doubles!Harp seals are also ice seals and are typically only seen in New Hampshire during the winter. The narrow-ridged finless porpoise (Neophocaena asiaeorientalis) is a newly accepted species, by the International Union for Conservation of Nature (IUCN), of porpoise endemic to the western Yangtze river in China and the East China Sea, Yellow Sea, and around Japan.There are two subspecies: the Yangtze finless porpoise (N. a. asiaeorientalis) and the East Asian finless porpoise (N. a. sunameri). Harbor seal pups can swim shortly after birth and can dive for up to 2 minutes when they are just 2-3 days old.Gray seals are also seen in New Hampshire year-round. Porpoise teeth are spade-shaped whilst dolphins are conical. Overview By Species Dolphins and porpoises are small, toothed whales belonging to a group of marine mammals called cetaceans. Females give birth in our area May-June and pups wean from their mother after 3-4 weeks. Females give birth on pack ice in late February to March. The distinguishing feature of the gray seal is its long snout, which is why they are sometimes referred to as “horseheads”. Males can reach up to 8 feet in length and can weigh in at a hefty 800 pounds. There are six species of porpoise, including the vaquita, which is the most endangered of all whales and dolphins. The Yangtze River, the longest river in Asia, used to be one of the only two rivers in the world that was home to two different species of dolphin—the Yangtze finless porpoise and the Baiji dolphin. Females give birth north of New Hampshire in January and February.
When hauled out on land, they tend to rest in a “banana-like” position, elevating their head and hind flippers. Most scientists agree that there are 32 dolphin species (plus five closely related species of river dolphin) and only six porpoise species. Gray seals are much larger than harbor seals and male gray seals are significantly larger than females. Their sides are gray and they have a distinct yellow-tan patch on their tail stock. One species also inhabits freshwater in Asia Includes the vaquita, the most endangered species of cetacean (the collective name for whales, dolphins and porpoises) Dall's porpoises can reach speeds of 55kph (35mph) Two species have whale,Porpoises are smaller than dolphins; they are less than 2.5m (8ft) long. Currently there are 49 dolphin and porpoise species which are grouped into six families: the oceanic dolphin family is by far the largest with 38 members; the porpoise family has seven members; and there are four river dolphin families, each containing just one species.However, classification is not an exact science and as more information and discoveries come to light, deliberations will continue and some dolphin species are likely to be further split into more than one species and/or subspecies. Learn all about Britain's dolphins, porpoise and whales – including identification, the best places to see them and boat excursions – with our guide to the UK's most common cetacean species. Photo credit: Encylopedia Brittanica,Short-beaked common dolphins are year-round residents of New England. Their coloring varies but they are generally a light to dark gray with darker spotting. Males are generally larger than females, measuring approximately 5 feet and weighing up to 245 pounds. This is because they are year-round residents of the east coast and they commonly haul out on land. The seal species commonly seen in New England’s coastal region are harbor, gray, harp, and hooded. They shed this coat after approximately 14 months, when they molt to their adult coat which is a gray coat with dark irregular blotches and a dark head. Females can reach up to 7 feet and 550 pounds. Pups are born with a creamy white coat that they shed after 2-3 weeks and they wean from their mother after 2-3 weeks. They can grow to be 8 feet long and up to 440 pounds.