Life in the World's Oceans Season 1 Episode 23 Marine Mammal Distribution around the Globe
- TV-PG
- February 2, 2018
- 33 min
With 60 million years of evolution on their side, marine mammals have adapted to the widest possible variety of marine ecological niches. Some live only in rivers or lakes, others only in waters over the continental shelves, and some in the open ocean. A few are even adapted to live at the poles.