They include animals such as seals, whales, manatees, sea otters and polar bears. Brown bears have been seen moving increasingly northward into territories formerly claimed by polar bears. Vatun appears as a massive Suel barbarian dressed in the skins of polar bears. Specimens are rare in tropical and polar latitudes. The shoulder height of an adult polar bear is . This let ice advance beyond the polar regions. It banned all importing of polar bear trophies. "Temperate Climate" refers to climates between Polar and Tropical. A husky is a sled dog used in polar regions. Lipid bilayers are generally impermeable to ions and polar molecules. Coverage in polar and south-hemisphere areas was poor. These conditions result in the best environment for the formation of polar mesospheric clouds. They have a worldwide distribution except for Australia and the polar regions. Each works effectively for separating analytes by relative polar differences. Mimi is presented as a character who behaves in ways which are polar opposites.