In the seal and sea lion species, for which measurements exist, the animals' urine contains up to two and a half times more salt than seawater does and … Elephant seals are one of the biggest pinnipeds and have less enemies than regular seals. It will take between four and six years for a harbor seal to be fully grown, at which time it may reach over five feet in length and 250 pounds. Seals live on average for 25 - 30 years, females usually live longer than males. Seals are marine mammals that can be found in diverse climates throughout the world.. Great white sharks and orcas are enemies of elephant seals because these two sea creatures have long and sharp teeth that can penetrate the seals' thick skin. All seals are On average, harbor seal milk is about 45% fat, 9% protein, and 45.8% water, with traces of lactose (milk sugar). They live to be about 35 years of age, perhaps more. Seals range in size from about 1 m (3 ft 3 in) and 45 kg (100 lb) such as the earless Baikal seal and eared Galapagos fur seal, up to the 5 m (16 ft) and 3,200 kg (7,100 lb) southern elephant seal. A female harbor seal has two mammary glands on her lower abdomen. The harsh Antarctic environment demanded that seals develop specific adaptations to successfully survive and reproduce. Mature Grey Seals grow much larger than Harbor Seals, reaching 8 feet and 800 pounds. Eye Adaptations Seals have large eyes with a spherical lens to see underwater where light is scarce -- a hunting adaptation that is essential for their survival. Harp seals are the victims of the largest slaughter of marine mammals in the world: the Canadian seal hunt. The Baikal seal lives only in the waters of Lake Baikal. Although they are often associated with the polar regions, seals may live near tropical beaches and in more moderate climates. US Navy In this excerpt from 100 Deadly Skills: The SEAL Operative's Guide , retired Navy SEAL Clint Emerson explains how to survive … Seal, any of 32 species of web-footed aquatic mammals that live chiefly in cold seas and whose body shape, round at the middle and tapered at the ends, is adapted to swift and graceful swimming. Learn about the cruel, ecologically irresponsible, and … How Do Seals Survive? They may have swum up rivers and streams or possibly Lake Baikal was linked to the ocean at some point through a large body of water, such as the West Siberian Glacial Lake or West Siberian Plain, formed in a previous ice age. Seals are an important part of the marine ecosystem. Male seals protect their young by fighting off other seals and other carnivorous marine animals while the females feed and take care of the young. It depends on which type of seal it is. To avoid an attack, the elephant seal speeds through or swims deep in the water. Harbor Seals vary in color between brown, tan and grey. How do seals protect their young? Navy SEALs during drown-proofing training. For instance, leopard seals make a living hunting down penguins and even other seals. Since some seals live where the weather and water are very cold, there are a few adaptations to help them stay warm. What do seals eat? It is something of a mystery how Baikal seals came to live there in the first place. This slaughter has taken the lives of over 2 million seal pups in the past decade. When we go out in cold weather, we wear a coat. Researchers believe they may do this because their relatively small body size cannot store enough fat to withstand a fast. This seal hunt is another example of DFO mismanagement of the ocean ecosystems. There are two types of seals: the earless, or true, seals; and the eared seals, which comprise the sea lions and fur seals. 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