Photo provided
by U.S. Fish & Wildlife Service
|
|
Marine
Mammals
Although
marine mammals spend much of their time in the ocean, they are
warm blooded, give live births, nurse their young, have traces
of hair or fur and must come to the surface to breathe air into
their lungs. Scientists believe that millions of years ago the
ancestors of marine mammals lived on land, then went into the
ocean. Over time these ancestors changed or adapted to their
new ocean environment.
Courtesy of the
Hawaiian Islands Humpback Whale National Marine Sanctuary
Photo by National Marine Fisheries Service
|
|
|