Extras
On Costa Rica’s Pacific coast, turtles and jaguars collide in unexpected ways.
Uncover the secret world of New York and London’s resilient pigeon flocks.
Who rules the streets -- and skies -- of the city?
Discover how pigeons find a mate for life.
Follow a female mountain lion in the Montana mountains over the course of a decade.
A mother mountain lion risks her life to feed her six kittens.
Mountain lions risk everything to hunt elk, prey more than twice their size.
Discover how rapidly declining sea ice is reshaping the future for walruses.
An orphaned baby walrus, just a week old, gets a second chance.
It was once believed that walruses dug for clams with their tusks, but the truth is even stranger.