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.
Most often (and mistakenly) referred to as the sea urchinâs roe or egg sack, uni refers to the gonadâthe organ in males and females responsible for producing sperm or eggs. Visually, uni resembles a chunk of grainy custard, somewhat like the surface of the tongue, but in different shades of orange. Once actually on the tongue, it turns into a soft, pillowy sensation that gradually disappears, leaving behind what is to many chefs the ultimate expression of the ocean in a solid ingredient.