Prominent among the family Ursidae is a polar bear that is adapted to a highly specialized semi-aquatic lifestyle. Although it is a bear yet it is listed as a marine mammal precisely due to the fact that it spends 50% of its life on ice floes and is able to swim as far as 90 km (60 miles).
urchin. 1  a mischievous boy. 2  any small boy or youngster. 3  sea urchin. 4  either of two small rollers covered with card clothing used in conjunction with the cylinder in carding. 5  Chiefly British Dialect. a hedgehog. 6  Obsolete. an elf or mischievous sprite.
Sea urchin Facts. Sea urchins are easily recognized type of marine animals. They belong to the group of animals called echinoderms. There are around 200 species of sea urchins that can be found in oceans throughout the world. Sea urchins usually live in warm waters on the rocky bottom or close to the coral reefs. <a href=http://www.softschools.com/facts/animals/sea_urchin_facts/479/>Sea urchin Facts</a>. Handwriting.