The sea otters along with many other animals are going extinct. They only live up to 15 years and with all this polution they are not able to live for that long. In California, great white sharks are the sea otters primary predator. In Alaska Great White Sharks are eating more sea oters because their usual prey (sea lions) are becoming more scarce. Along with the Great White Sharks bears, eagles, and coyotes are also predators of the sea lion. Sea otters eat urchins, abalone, muscles, clams, crabs, snails, and 40 other marine species. Sea otters consume 25% of their weight in food to support their high metabolism. Soon after that they became under the Marine Mammal Protection and they were listed as endangered Species. After that the numbers are increasing steadily but they are still way under the original population of the Sea Otters back then. Oil spills from offshore drilling or shipping are a threat to sea otter populations. When sea otters come into contact with oil, it causes their fur to mat, which prevents it from insulating their bodies. Without this natural protection from the frigid water, sea otters can quickly die from hypothermia. The toxicity of oil can also be harmful to sea otters, causing liver and kidney failure as well as severe damage to their lungs and eyes. Direct conflict with humans, such as shootings and entrapment in fishing traps and nets pose a major threat to sea otter populations. Since sea otters eat many of the same shellfish humans like to eat, such as sea urchins, lobster and crab, they often find themselves in the same areas fishermen like to harvest. Some shell fishers view sea otters as competition and a threat to their economic gain. Many fishermen use fishing gear that can entangle sea otters and cause them to drown. Sea otters only have about two babies a year. They do not reproduce enough for the fur traders to keep killing them.