There is no more salmon. That's what native Alaskan Ricko DeWilde is most concerned with these days. The cast member and segment producer on National Geographic's, "Life Below Zero: First Alaskans," ...

In a swath of open ocean surrounding four volcanic islands off the west coast of Mexico, sharks and manta rays swim free. Humpback whales birth and raise their young. More than 300 species of fish, of ...