Strong-willed Herbie takes a lesson in obedience.

Some "horse whisperers," like Mark Rashid, specialize in helping riders and trainers communicate with their horses. Good communication helps improve a horse's behavior.

Sausha Seus, who handled the wolves that played Lobo and Blanca in NATURE's "The Wolf That Changed America," talks about the experience of filming live wolves.

During the 20th century, as humans have encroached more and more on animals' territory, zoos have come to be more than just places to view wild animals.

NATURE follows a venerated elephant trainer and several of his young trainees in their travels 1,500 miles from their homes in India.