Pub. date: 2008 | Online Pub. Date: April 25, 2008 | DOI: 10.4135/9781412963893 | Print ISBN: 9781412958783 | Online ISBN: 9781412963893| Publisher:SAGE Publications, Inc.About this encyclopedia
Edward Christien & Michael Parsons
MARINE MAMMALS ARE members of the Class Mammalia possessing significant adaptations to allow them to live in an aquatic environment (to a greater or lesser extent) and derive all (or most) of their nutritional needs from the sea. Some marine mammals are entirely aquatic, while others may spend part of their lives on land. The polar bear, for example, is considered a marine mammal, as it typically inhabits pack ice (up to 807 mi., or 1300 km. from shore); it will attack ...