Extras
Sixty million American bison once thundered across the prairies of North America.
Sea otters are back, and their return is a breath of fresh air for the waters of Monterey Bay.
There鈥檚 no lizard like a chameleon鈥攃olor-shifting, tree-climbing, eye-swiveling magic.
Despite cultural taboos, herpetologist Fandresena Rakotoharimalala is determined to save chameleons.
It takes 15 years of care before a baby Radiated Tortoise is ready for life in the wild.
In the otherworldly Spiny Forest of Madagascar, a historic release is about to take place.
The Bear River was once a lush area with wetlands, hot springs, and abundant wildlife.
Terry Masear helps rescue baby hummingbird twins whose mother died.
Meet the world鈥檚 first sloth detective dog, Keysha.