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.
An ostomy is a surgical operation that creates a new outside opening for body wastes. The new opening is called a stoma. A stoma may be created to divert feces, urine or both. The stoma is created from a piece of the intestines or urinary tract which is pulled through a cut in the abdomen and stitched to the skin. Ostomies can be permanent or temporary, and sometimes more than one is needed.