... A fur seals gestation period is approximately 11 to 12 months, after which they give birth to a single pup. Grey seals. A red fox is pregnant for about 50 days. At, birth, grey seal pups weigh about 13 kg. Looking straight on, their nostrils are parallel, rather than v-shaped as in common seals. and are covered in long, creamy white hair. This is a medium sized seal when it is full grown. Mainly grey in colour, the unique pattern of darker blotches and spots can be used to identify individuals. The Gray Seal is one that many people have seen in pictures. During … How long is a seal pregnant? Grey seals have a long, sloping 'Roman nose'. The grey seal (Halichoerus grypus) is found on both shores of the North Atlantic Ocean.It is a large seal of the family Phocidae which are commonly referred to as "true seals" or "earless seals". These seals are effective hunters because they have excellent vision and hearing. The grey seal has also been called "Horsehead Seal", due to its distinctive long head. The shoulders of the male are massive with the overall bulk supplemented by a buildup of scar tissue from fighting during breeding seasons. And weigh up to 900 pounds. Harbour seals are more common in the region with a small breeding colony in Chichester Harbour. They are also known as “earless seals.” Grey Seals are protected in the United States by the Marine Mammal Protection Act. The Seals are generally only at their breeding grounds for 2 or 3 weeks during which time pregnant females deliver (after an 11 month pregnancy) and new mating occurs. They often hunt in groups, which makes it easier for them to catch their prey. about 64 months. Hooded Seal males become sexually mature at around 6 years of age while females mature anywhere from 3 to 6 years. Adult males weigh up to 300kg and can be 2m in length, while adult females weigh up to 180kg and are about 1.8m long. Grey seals are vulnerable to typical predators for a pinniped mammal. The … Adult harp seals grow to be 1.7 to 2.0 m (5 ft 7 in to 6 ft 7 in) long and weigh from 115 to 140 kg (254 to 309 lb). Evidence for a long-lasting single administration contraceptive vaccine in wild grey seals Baby seals, called pups, will stay on land until their waterproof fur grows in. Having one of the most spectacularly visual (to humans) reproductive habits of all the marine mammals, the elephant seal reproduces during winter. Gray seals gather in large groups during the mating/pupping, and molting seasons. Breeding season is during the spring. While seals will haul out throughout the year in small groups, once… After the brief courtship and one-night stand with the male, the female shark is left to carry the fertilized eggs in her oviduct, or womb.Gestation periods for sharks vary, from about five to six months to two years [sources: Carrier, Oregon Coast Aquarium].The spiny dogfish shark has the longest gestation period, not just of sharks, but of all vertebrates, at 24 months [source: Bester]. The gray seal can eat 10 pounds (4.53 kilograms) of food in one day. Gray whales reach sexual maturity somewhere between 5 and 11 years of age, a gray whale that lives to be 40 years old could have as many as 18 calves. Unanswered Questions. 10 things you might not now about the grey seal… Grey seals have been known to dive to depths of 300m and stay underwater for up to 20 minutes.