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They also have small external (outside) ears. With fur seals, they make up the group of eared seals. Sea lions can reach 11.5 feet (3.5 meters) in length and weigh up to 2,200 pounds (1,000 kilograms). Males are much larger than females. Sea lions eat fish, mollusks, and crustaceans. Some even eat penguins.
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Diving adaptations
The sea lions' bodies control heart rate, gas exchange, digestion rate, and blood flow to allow them to dive for a long period of time and prevent side effects of high pressure at depth. One of the ways sea lions deal with the extreme pressures is by limiting the amount of gas exchange that occurs when diving. They can reduce their heart rate to well below surface rates. Also, sea lions can limit digestion rate and decrease it by at least 54%.
Parasites and diseases
Galapagos sea lions (Zalophus wollebaeki) can be infected with Philophthalmus zalophi, an eye fluke. These infections have heavy impacts on the survival of juveniles. The disease appears to be compounded by global warming. Sea lions are affected by the parasites from the early ages of 3 weeks old up until the age of 4 to 8 months. The parasites found in the eye fluke did serious damage to the eye. From the data collected, 21 of the 91 survived; with a total of 70 deaths in just a span of two...
Population
Otaria flavescens(South American sea lion) lives along the Chilean coast with a population estimate of 165,000. According to the most recent surveys in northern and southern Chile the sealing period of the middle twentieth century that left a significant decline in sea lion population is recovering. The recovery is associated with less hunting, otariids rapid population growth, legislation on nature reserves, and new food resources. Haul-out patterns change the abundance of sea lions at parti...
South American sea lions have been greatly impacted by human exploitation. The number of sea lions declined due hunting of the species and exploitation of the species’ environment. Although sealing has been put to a halt in many countries, such as Uruguay, the sea lion population continues to decline because of the drastic effects humans have on th...
Sea lions are related to walruses and seals.The sea lions have six extant and one extinct species (the Japanese sea lion) in five genera.They have an average lifespan of 20–30 years.A male California sea lion weighs on average about 300 kg (660 lb) and is about 2.4 m (8 ft) long, while the female sea lion weighs 100 kg (220 lb) and is 1.8 m (6 ft) long.The U.S. population of California sea lions is estimated at 210,000. Population estimates in other areas are considered unreliable. California sea lions are not typically found more than 10 miles (16 kilometers) from the Pacific coastline. They usually congregate on islands and remote shorelines when not in the ocean.
As marine mammals, sea lions spend time in the water and on land, and they usually live and hunt in large groups. However, during the breeding season, only the dominant males are allowed to pair up and mate. They compete for dominance, and the winner couples with an average of 16 females during the season. Sea lions are predators.
Oct 1, 2021 · Sea lions are marine mammals of the Otariidae family.b. Sea lions are large marine mammals native to all of the world's oceans. Together with the fur seals, they comprise the family Otariidae: the eared seals. Sea lions are characterized by external ear flaps, long fore flippers, short, thick hair, and a big chest and belly.
Males are very large and can weigh from 1,500 pounds up to 1 ton. They can measure up to 12 feet in length. Female sea lions are much smaller with a weight of 700 pounds and average about 9 feet in length. Sea lions do not have very good eyesight and it is believed that they are nearsighted.
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Aug 3, 2020 · Male sea lions can grow to 2 to 3 meters long and weigh 200 to 1,000 kilograms, while females can grow to 1.3 to 2.7 meters long and weigh 50 to 270 kilograms. They also have very sensitive whiskers that aid in fish detection and their eyes have a reflective membrane that allows them to see in the dark underwater.
