Humpbacks have been swimming our seas for seven million years.
Female humpbacks carry the memories of their migrations from generation to generation.
They show their young the route that each whale will travel for the rest of its life.
Without their mothers to guide them, baby humpbacks would be lost at sea.
Mara still remembers her first migration from these waters to her Antarctic feeding grounds.
She swam beside her mother the entire way.
The journeys of humpbacks are far, some as long as 10,000 miles to the poles.
There was much to see and learn, and companions who helped to show the way.
They rarely rested. Always they kept moving, drawn on by a growing hunger.
Even at night, they continued.