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Encyclopedia of Marine Mammals
M arine mammals live, feed, and reproduce in a vast, threedimensional fl uid environment-the ocean. Air-breathing necessitates frequent attendance to the sea surface for all marine mammals, whereas pinnipeds cannot reproduce in the water and have thus retained a close tie to land or ice. Despite these ties to the boundaries of the ocean environment, oceanography is an important part of the study of marine mammals. Habitat and distribution of marine mammals are affected by the physical anddoi:10.1016/b978-0-12-373553-9.00185-1 fatcat:nw5gxur23jdz7kw54h73r4cr5q