A team of Thai researchers has been tracking the clouded leopard for three years - without even a glimpse.

This is one laid-back zebra shark. Seymour the shark will flip over on his back to allow veterinarians to take an ultrasound.

Gudrun Pfleuger returns to the very same place where she came face-to-face with wild wolves three years earlier.

Throughout the brutally cold winter, Gudrun has searched for signs of life within the wild wolf population - finally, she finds evidence.

At home in the Alps, surrounded by those she loves, Gudrun reflects on her journey from field biologist, to cancer survivor, to mother.

Take if from a woman who has been face-to-face with the wildest of wolves, there is a right way and wrong way to treat wild wolves.

Learn the call of the wild. Field biologist Gudrun Pflueger reviews the techniques of the perfect wolf call.