Balaenoptra Borealis is the scientific term for the animal. It is currently on the IUCN red list and is being protected. Sei Whales didn't become a priority until 2008. There are about 80,000 left as of 2008 and they are on the endangered level. It lives in the ocean biome in temperate water. The Sei Whale can hang around most continents and countries including the U.S., Australia, and the U.K.. It is endangered because of whaling industries from the 1950s - 1970s. The Sei Whale eats many things like zooplankton, fish, and squid. The species has to be at least 8 years old to have children and they have one baby at a time. They can reach 64 ft. in length and 28 tons in weight. They can also reach 31 miles per hour in speed.