Extras
On Costa Rica’s Pacific coast, turtles and jaguars collide in unexpected ways.
Who rules the streets -- and skies -- of the city?
Uncover the secret world of New York and London’s resilient pigeon flocks.
Discover how pigeons find a mate for life.
Times Square never shuts down, and neither do its pigeons.
Follow a female mountain lion in the Montana mountains over the course of a decade.
Mountain lions risk everything to hunt elk, prey more than twice their size.
A mother mountain lion risks her life to feed her six kittens.
It was once believed that walruses dug for clams with their tusks, but the truth is even stranger.
Discover how rapidly declining sea ice is reshaping the future for walruses.