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.
Sushi Items â Uni (Sea Urchin) Uni (oo-nee) is the Japanese name for the edible part of the Sea Urchin. While colloquially referred to as the roe (eggs), uni is actually the animalâs gonads (which produce the milt or roe). Uni ranges in color from rich gold to light yellow, and has a creamy consistency that some love and is off-putting to others.